<?php
/************************************************************************
 * Mailer v0.2.1-FINAL                                Start: 10/25/2009 *
 * ===================                          Last change: 10/25/2009 *
 *                                                                      *
 * -------------------------------------------------------------------- *
 * File              : extensions-functions.php                         *
 * -------------------------------------------------------------------- *
 * Short description : Extension management                             *
 * -------------------------------------------------------------------- *
 * Kurzbeschreibung  : Erweiterungen-Management                         *
 * -------------------------------------------------------------------- *
 * $Revision::                                                        $ *
 * $Date::                                                            $ *
 * $Tag:: 0.2.1-FINAL                                                 $ *
 * $Author::                                                          $ *
 * -------------------------------------------------------------------- *
 * Copyright (c) 2003 - 2009 by Roland Haeder                           *
 * Copyright (c) 2009 - 2012 by Mailer Developer Team                   *
 * For more information visit: http://mxchange.org                      *
 *                                                                      *
 * This program is free software; you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation; either version 2 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program; if not, write to the Free Software          *
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,               *
 * MA  02110-1301  USA                                                  *
 ************************************************************************/

// Some security stuff...
if (!defined('__SECURITY')) {
	die();
} // END - if

// Load the extension and maybe found language and function files.
function loadExtension ($ext_name, $ext_mode, $ext_ver = '0.0.0', $isDryRun = FALSE, $previousExtension = NULL) {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_mode=' . $ext_mode . ',ext_ver=' . $ext_ver . ',isDryRun=' . intval($isDryRun) . ' - ENTERED!');
	// Loading an extension in same mode, but not test/update, twice is not
	// good, so is the extension $ext_name already loaded in mode $ext_mode?
	if ((isset($GLOBALS['loaded_extension'][$ext_name][$ext_mode])) && (!in_array($ext_mode, array('update', 'test')))) {
		// If this happens twice, we need the bug report from you, except for updates/tests
		reportBug(__FUNCTION__, __LINE__, __FUNCTION__ . '() is called twice: ext_name=' . $ext_name . ', ext_mode='. $ext_mode . ',ext_sqls=' . print_r(getExtensionSqls(), TRUE) . ', ext_register_running=' . print_r($GLOBALS['ext_register_running'], TRUE) . ', ext_running_updates=' . print_r($GLOBALS['ext_running_updates'], TRUE));
	} // END - if

	// Make sure this situation can only happen once
	$GLOBALS['loaded_extension'][$ext_name][$ext_mode] = TRUE;

	// Remember previous extension here
	$GLOBALS['previous_extension'][$ext_name] = $previousExtension;

	// Set extension mode
	setExtensionMode($ext_mode);

	// Set current extension name
	setCurrentExtensionName($ext_name);

	// By default all extensions are in productive phase
	enableExtensionProductive();

	if (!empty($ext_ver)) {
		// Set current extension version
		setCurrentExtensionVersion($ext_ver);
	} else {
		// Set it to 0.0 by default
		setCurrentExtensionVersion('0.0.0');

		// Is the extension installed?
		if ((isExtensionInstalled($ext_name)) && ($ext_mode != 'register')) {
			// Get extension's version
			setCurrentExtensionVersion(getExtensionVersion($ext_name));
		} // END - if

		// In all but test-mode we need these messages to debug! Please report all (together, e.g.)
		if (($ext_mode != 'test') && (getCurrentExtensionVersion() == '0.0.0')) {
			// Abort here, this must now always be set!
			reportBug(__FUNCTION__, __LINE__, 'Extension version is empty, setting to 0.0.0 ext_name=' . $ext_name . ', ext_mode=' . $ext_mode . ', isDryRun=' . intval($isDryRun));
		} // END - if
	}

	// Set dry-run
	enableExtensionDryRun($isDryRun);

	// Init array
	initIncludePool('extension');

	// Init EXT_UPDATE_DEPENDS if not yet done
	if (!isExtensionUpdateDependenciesInitialized()) {
		// Init here...
		initExtensionUpdateDependencies();
	} // END - if

	// Init current extension name list
	initExtensionSqls();

	// Is the extension already loaded?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Loading extension ' . $ext_name . ', getExtensionMode()=' . getExtensionMode() . ', getCurrentExtensionVersion()=' . getCurrentExtensionVersion());
	if ((isExtensionLoaded($ext_name)) && (getExtensionMode() == 'init')) {
		// Debug message
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("Extension %s already loaded.", $ext_name));

		// Abort here
		return FALSE;
	} // END - if

	// Is the extension file NOT there?
	if (!isExtensionNameValid($ext_name)) {
		// Debug message
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("Extension %s not found or not readable or the PHP script is deprecated.", $ext_name));

		// Abort here
		return FALSE;
	} // END - if

	// Load extension's own language file if not in test mode
	if ((getExtensionMode() != 'test') && (ifExtensionHasLanguageFile($ext_name))) {
		// Load it
		loadLanguageFile($ext_name);
	} // END - if

	// Is there cache?
	if (isExtensionFunctionFileReadable($ext_name)) {
		// Not yet loaded?
		if ((($GLOBALS['cache_array']['extension']['ext_func'][$ext_name] == 'Y') || (!isset($GLOBALS['cache_array']['extension']['ext_func'][$ext_name]))) && (!isExtensionLibraryLoaded($ext_name))) {
			// Construct IFN for functions file
			$funcsInclude = sprintf("inc/libs/%s_functions.php", $ext_name);

			// Mark it as loaded
			markExtensionLibraryAsLoaded($ext_name);

			// Download functions file
			loadIncludeOnce($funcsInclude);
		} // END - if
	} elseif ((!isset($GLOBALS['cache_array']['extension']['ext_func'][$ext_name])) && (isDebugModeEnabled()) && (isHtmlOutputMode()) && ($ext_name != 'sql_patches') && (substr($ext_name, 0, 10) != 'admintheme') && (getExtensionMode() == 'test')) {
		// No functions file is not so good...
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("NOTICE: Extension %s has no own functions file or we cannot read from it. mode=%s",
			$ext_name,
			getExtensionMode()
		));
	}

	// Load extension's filter library if present
	loadExtensionFilters($ext_name);

	// Extensions are not deprecated by default
	setExtensionDeprecated('N');

	// Extensions are not always active by default
	setExtensionAlwaysActive('N');

	// Include the extension file
	loadCurrentExtensionInclude();

	// Is this extension deprecated?
	if ((isExtensionDeprecated()) && (!in_array(getExtensionMode(), array('test', 'update', 'deactivate'))) && (isExtensionActive($ext_name))) {
		// Deactivate the extension
		doDeactivateExtension($ext_name);

		// Abort here
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Extension load aborted, ext_name=' . $ext_name . ' - Extension is deprecated.');
		return FALSE;
	} // END - if

	// Mark it as loaded in normal mode
	if (getExtensionMode() == '') {
		// Mark it now...
		markExtensionAsLoaded($ext_name);
	} // END - if

	// All fine!
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Extension successfully loaded, ext_name=' . $ext_name);
	return TRUE;
}

// Registers an extension and possible update dependencies
function registerExtension ($ext_name, $taskId, $isDryRun = FALSE, $ignoreUpdates = FALSE, $previousExtension = NULL) {
	// Set current extension name
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',taskId=' . intval($taskId) . ',isDryRun=' . intval($isDryRun) . ',ignoreUpdates=' . intval($ignoreUpdates) . ' - ENTERED!');
	setCurrentExtensionName($ext_name);

	// Enable dry-run
	enableExtensionDryRun($isDryRun);

	// By default all extensions are in productive phase
	enableExtensionProductive();

	// This shall never do a non-admin user or if the extension is active (already installed)
	if (((!isAdmin()) && (!isInstallationPhase())) || (isExtensionInstalled($ext_name))) {
		// Abort here with 'false'
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - ABORTED: isAdmin()=' . intval(isAdmin()) . ',isInstallationPhase()=' . intval(isInstallationPhase()) . ',isExtensionInstalled()=' . intval(isExtensionInstalled($ext_name)));
		return FALSE;
	} // END - if

	// When this extension is already in registration/update phase, all is fine
	if ((isExtensionRegistrationRunning($ext_name)) || ((isExtensionUpdateRunning($ext_name)) && ($ignoreUpdates === FALSE))) {
		// Then abort here with 'true' becaus it is fine
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - already in registration/update phase, all fine,taskId=' . $taskId . ',isDryRun=' . intval($isDryRun) . ',ignoreUpdates=' . intval($ignoreUpdates));
		//* BUG: */ reportBug(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',taskId=' . $taskId . ',isDryRun=' . intval($isDryRun) . ',ignoreUpdates=' . intval($ignoreUpdates) . ' - Please investigate!');
		return TRUE;
	} // END - if

	// This registration is running
	addExtensionRunningRegistration($ext_name);

	// Init EXT_UPDATE_DEPENDS if not yet done
	if (!isExtensionUpdateDependenciesInitialized()) {
		// Init here...
		initExtensionUpdateDependencies();
	} // END - if

	// Is the task id zero? Then we need to auto-fix it here
	if (((is_null($taskId)) || ($taskId == '0')) && (!isInstallationPhase())) {
		// Try to find the task
		$taskId = determineExtensionTaskId(getCurrentExtensionName());

		// Still zero and not in dry-run?
		if (((is_null($taskId)) || ($taskId == '0')) && (!isExtensionDryRun())) {
			// Now try to create a new task
			$taskId = createNewExtensionTask(getCurrentExtensionName());

			// Is it still zero?
			if ((is_null($taskId)) || ($taskId == '0')) {
				// Then request a bug report
				reportBug(__FUNCTION__, __LINE__, sprintf("%s: task_id is still zero after determineExtensionTaskId/createNewExtensionTask(%s)",
					__FUNCTION__,
					getCurrentExtensionName()
				));
			} // END - if
		} // END - if
	} // END - if

	// Init queries and notes
	initExtensionSqls();
	initExtensionNotes();

	// Init variables
	$ret = FALSE;
	$processResult = FALSE;
	initIncludePool('extension');

	// By default we have no failures
	enableExtensionReportingFailure();

	// Does this extension exists?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ' - CALLING loadExtension() ...');
	if (loadExtension(getCurrentExtensionName(), 'register', '0.0.0', isExtensionDryRun(), $previousExtension)) {
		// Set current extension name again
		setCurrentExtensionName($ext_name);

		// And run possible updates
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName());
		$history = getExtensionVersionHistory();
		foreach ($history as $ext_ver) {
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ', ext_ver=' . $ext_ver);
			// Load extension in update mode
			loadExtension(getCurrentExtensionName(), 'update', $ext_ver, isExtensionDryRun(), $previousExtension);

			// Add update notes to our output
			addExtensionNotes($ext_ver);
		} // END - foreach

		// Does this extension depends on an outstanding update of another update?
		for ($dmy = getExtensionUpdateIterator(); getExtensionUpdateIterator() < countExtensionUpdateDependencies();) {
			// Get next update
			$ext_update = getExtensionUpdateDependenciesIterator();

			// Increment here to avoid endless loop
			incrementExtensionUpdateIterator();

			// Check if extension is not installed and not already in registration procedure and if loading it wents finally fine...
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',isExtensionRegistrationRunning(' . $ext_update . ')=' . intval(isExtensionRegistrationRunning($ext_update)));
			if ((!isExtensionInstalled($ext_update)) && (!isExtensionRegistrationRunning($ext_update)) && (loadExtension($ext_update, 'test', '', isExtensionDryRun(), $previousExtension))) {
				// Set current extension name again
				setCurrentExtensionName($ext_name);

				// If versions mismatch update extension first
				$ext_ver = '';
				if (isExtensionInstalled($ext_update)) {
					// Get version only if installed
					$ext_ver = getExtensionVersion($ext_update);
				} // END - if

				// Extension version set? If empty the extension is not registered
				//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_ver[' . gettype($ext_ver) . ']=' . $ext_ver . ',isInstallationPhase()=' . intval(isInstallationPhase()) . ',currName=' . getCurrentExtensionName() . ',ext_update=' . $ext_update . ' - EMPTY?');
				if (empty($ext_ver)) {
					// Extension not registered so far so first load task's id...
					$updateTaskId = determineExtensionTaskId($ext_update);

					// Entry found?
					//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'updateTaskId=' . $updateTaskId . ',isInstallationPhase()=' . intval(isInstallationPhase()) . ',currName=' . getCurrentExtensionName() . ',ext_update=' . $ext_update . ' - CHECKING!');
					if (($updateTaskId > 0) || (isInstallationPhase())) {
						// Try to register the extension
						//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',ext_update=' . $ext_update . ',updateTaskId=' . $updateTaskId . ',isExtensionDryRun()=' . intval(isExtensionDryRun()));
						$processResult = registerExtension($ext_update, $updateTaskId, isExtensionDryRun(), TRUE, $ext_name);

						// Reset extension name
						setCurrentExtensionName($ext_name);
						//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',ext_update=' . $ext_update . ',processResult=' . intval($processResult));
					} // END - if
				} elseif ($ext_ver != getCurrentExtensionVersion()) {
					// Ok, update this extension now
					//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',currVer=' . getCurrentExtensionVersion());
					$GLOBALS['ext_backup_name'][$ext_update][$ext_ver] = getCurrentExtensionName();
					$GLOBALS['ext_backup_ver'][$ext_update][$ext_ver] = getCurrentExtensionVersion();
					updateExtension($ext_update, $ext_ver, isExtensionDryRun());
					setCurrentExtensionName($GLOBALS['ext_backup_name'][$ext_update][$ext_ver]);
					setCurrentExtensionVersion($GLOBALS['ext_backup_ver'][$ext_update][$ext_ver]);
					unset($GLOBALS['ext_backup_name'][$ext_update][$ext_ver]);
					unset($GLOBALS['ext_backup_ver'][$ext_update][$ext_ver]);
					//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',currVer=' . getCurrentExtensionVersion());

					// All okay!
					$processResult = TRUE;
				} else {
					// Nothing to register / update before...
					$processResult = TRUE;
				}
			} else {
				// Required file for update does not exists!
				$processResult = TRUE;
				// But this is fine for the first time...
			}

			// Restore the current extension name
			setCurrentExtensionName($ext_name);
		} // END - for

		// Is there no update?
		if (countExtensionUpdateDependencies(getCurrentExtensionName()) == 0) {
			// Then test is passed!
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',processResult=true,countExtensionUpdateDependencies()=0 - Test passed!');
			$processResult = TRUE;
		} // END - if

		// Switch back to register mode
		setExtensionMode('register');

		// Remains true if extension registration reports no failures
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',processResult=' . intval($processResult));
		$processResult = (($processResult === TRUE) && (isExtensionReportingFailure() === FALSE));
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',processResult=' . intval($processResult));

		// Does everthing before wents ok?
		if ($processResult === TRUE) {
			// "Dry-run-mode" activated?
			if ((isExtensionDryRun() === FALSE) && (!isExtensionOnRemovalList())) {
				// Init SQLs and transfer ext->generic
				//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName());
				initSqls();
				setSqlsArray(getExtensionSqls());

				// Run installation pre-installation filters
				runFilterChain('pre_extension_installed', array('dry_run' => isExtensionDryRun(), 'enable_codes' => FALSE));

				// Register extension
				//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'insert=' . getCurrentExtensionName() . '/' . getCurrentExtensionVersion() . ' - INSERT!');
				if (isExtensionInstalledAndNewer('sql_patches', '0.0.6')) {
					// New way, with CSS
					//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ',always_active=' . getThisExtensionAlwaysActive() . ', ext_ver=' . getCurrentExtensionVersion() . 'ext_css=' . getExtensionHasCss());
					SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_extensions` (`ext_name`, `ext_active`, `ext_version`, `ext_has_css`) VALUES ('%s','%s','%s','%s')",
						array(
							getCurrentExtensionName(),
							getThisExtensionAlwaysActive(),
							getCurrentExtensionVersion(),
							getExtensionHasCss()
						), __FUNCTION__, __LINE__);
				} else {
					// Old way, no CSS
					//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ',always_active=' . getThisExtensionAlwaysActive() . ', ext_ver=' . getCurrentExtensionVersion());
					SQL_QUERY_ESC("INSERT INTO `{?_MYSQL_PREFIX?}_extensions` (`ext_name`, `ext_active`, `ext_version`) VALUES ('%s','%s','%s')",
						array(
							getCurrentExtensionName(),
							getThisExtensionAlwaysActive(),
							getCurrentExtensionVersion()
						), __FUNCTION__, __LINE__);
				}

				// Use the insert id as extension id and cache it for early usage
				$GLOBALS['cache_array']['extension']['ext_id'][getCurrentExtensionName()] = SQL_INSERTID();
				$GLOBALS['cache_array']['extension']['ext_name'][SQL_INSERTID()] = getCurrentExtensionName();

				// Mark it as installed
				$GLOBALS['ext_is_installed'][getCurrentExtensionName()] = TRUE;

				// Remove cache file(s) if extension is active
				runFilterChain('post_extension_installed', array(
					'pool'     => 'extension',
					'ext_name' => getCurrentExtensionName(),
					'task_id'  => $taskId
				));

				// Re-init queries and notes
				initExtensionSqls(TRUE);
				initExtensionNotes(TRUE);

				// In normal mode return a true on success
				$ret = TRUE;
			} elseif (isExtensionDryRun() === TRUE) {
				// In  "dry-run" mode do always return a true
				$ret = TRUE;
			} else {
				// Extension has been removed for updates, so all is fine!
				$ret = TRUE;
			}
		} else {
			// No, an error occurs while registering extension :-(
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName());
			$ret = FALSE;
		}
	} elseif (($taskId > 0) && (getCurrentExtensionName() != '')) {
		// Remove task from system when id and extension's name is valid
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
		SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM `{?_MYSQL_PREFIX?}_task_system` WHERE `id`=%s AND `status`='NEW' LIMIT 1",
			array(bigintval($taskId)), __FUNCTION__, __LINE__);
	}

	// @TODO This redirect is still needed to register sql_patches! Please try to avoid it
	if (($ret === TRUE) && ($isDryRun === FALSE) && ($ext_name == 'sql_patches') && (!isInstallationPhase())) {
		/*
		 * This is a really dirty hack to prevent an error about a missing
		 * configuration entry which should be there after registration of
		 * ext-sql_patches.
		 */
		redirectToRequestUri();
	} // END - if

	// Return status code
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',currName=' . getCurrentExtensionName() . ',processResult=' . intval($processResult) . ',ret=' . intval($ret) . ' - EXIT!');
	return $ret;
}

// Run SQL queries for given extension id
// @TODO Change from ext_id to ext_name (not just even the variable! ;-) )
function doExtensionSqls ($ext_id, $load_mode) {
	// This shall never do a non-admin user but installation phase is okay
	if ((!isAdmin()) && (!isInstallationPhase())) {
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_id=' . $ext_id. ',load_mode=' . $load_mode . ',isAdmin()=' . intval(isAdmin()) . ',isInstallationPhase()=' . intval(isInstallationPhase()) . ' - ABORT!');
		return FALSE;
	} // END - if

	// Get extension's name
	$ext_name = getExtensionName($ext_id);

	// Set current SQL name
	setCurrentExtensionName($ext_name);

	// Init EXT_UPDATE_DEPENDS
	if (!isExtensionUpdateDependenciesInitialized()) {
		// Init here...
		initExtensionUpdateDependencies();
	} // END - if

	// Init array
	initExtensionSqls(TRUE);

	// By default no SQL has been executed
	$sqlRan = FALSE;

	// Load extension in detected mode
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name[' . $ext_id . ']=' . getCurrentExtensionName() . ',load_mode=' . $load_mode);
	loadExtension(getCurrentExtensionName(), $load_mode, '0.0.0', FALSE);

	// Init these SQLs
	initSqls();
	setSqlsArray(getExtensionSqls());

	// Debug message
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'SQLs::count=' . countSqls());

	// Are there entries?
	if (isSqlsValid()) {
		// Run SQL commands...
		runFilterChain('run_sqls');
	} // END - if

	// Run any filters depending on the action here
	runFilterChain('extension_' . $load_mode);

	// Remove cache file(s) if extension is active
	if (((isExtensionActive('cache')) && ((!SQL_HASZEROAFFECTED()) || ($sqlRan === TRUE) || ($load_mode == 'activate') || ($load_mode == 'deactivate')))) {
		// Run filters
		runFilterChain('post_extension_run_sql', getCurrentExtensionName());
	} // END - if

	// Is this the sql_patches?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'id=' . $ext_id . ',currName=' . getCurrentExtensionName() . ',loadMode=' . $load_mode);
	if ((getCurrentExtensionName() == 'sql_patches') && (($load_mode == 'register') || ($load_mode == 'remove'))) {
		// Then redirect to logout
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, ': LOAD!');
		redirectToUrl('modules.php?module=admin&amp;logout=1&amp;' . $load_mode . '=sql_patches');
	} // END - if
}

// Check whether the given extension is installed
function isExtensionInstalled ($ext_name) {
	// We don't like empty extension names here
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - ENTERED!');
	if (empty($ext_name)) {
		// Please fix them all
		reportBug(__FUNCTION__, __LINE__, 'ext_name is empty.');
	} // END - if

	// By default non is installed
	$isInstalled = FALSE;

	// Check if there is a cache entry
	if (isset($GLOBALS['ext_is_installed'][$ext_name])) {
		// Use cache built from below queries
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - CACHE!');
		$isInstalled = $GLOBALS['ext_is_installed'][$ext_name];
	} elseif (isset($GLOBALS['cache_array']['extension']['ext_id'][$ext_name])) {
		// Found!
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - FOUND!');
		$isInstalled = TRUE;

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} elseif (isInstallationPhase()) {
		// Extensions are all inactive/not installed during installation
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - installation phase detected.');
	} else {
		// Look in database
		$ext_id = getExtensionId($ext_name);

		// Is there a record?
		$isInstalled = ($ext_id > 0);

		// Log debug message
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_id=' . $ext_id . ',isInstalled=' . intval($isInstalled));

		// Is it installed, then cache the entry
		if ($isInstalled === TRUE) {
			// Dummy call (get is okay here)
			getExtensionId($ext_name, TRUE);
		} // END - if

		// Remember the status
		$GLOBALS['ext_is_installed'][$ext_name] = $isInstalled;
	}

	// Return status
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',isInstalled=' . intval($isInstalled) . ' - EXIT!');
	return $isInstalled;
}

// Check if given extension is active
function isExtensionActive ($ext_name) {
	if (isInstallationPhase()) {
		// Extensions are all inactive during installation
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Extensions are always inactive while installation phase. ext_name=' . $ext_name);
		return FALSE;
	} elseif (empty($ext_name)) {
		// Empty extension names must befixed
		reportBug(__FUNCTION__, __LINE__, 'Empty extension name provided.');
	} elseif (!isExtensionInstalled($ext_name)) {
		// Not installed extensions are always inactive
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Not installed extensions are always inactive. ext_name=' . $ext_name);
		return FALSE;
	}

	// Not active is the default
	$data['ext_active'] = 'N';

	// Check cache
	if (isset($GLOBALS['cache_array']['extension']['ext_active'][$ext_name])) {
		// Load from cache
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'CACHE! ext_name=' . $ext_name);
		$data['ext_active'] = $GLOBALS['cache_array']['extension']['ext_active'][$ext_name];

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} elseif (isExtensionLoaded($ext_name)) {
		// @TODO Extension is loaded, what next?
		reportBug(__FUNCTION__, __LINE__, 'LOADED:' . $ext_name);
	} elseif (($ext_name == 'cache') || (!isExtensionInstalled('cache'))) {
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'DB! ext_name=' . $ext_name);
		// Load from database
		$result = SQL_QUERY_ESC("SELECT `ext_active` FROM `{?_MYSQL_PREFIX?}_extensions` WHERE `ext_name`='%s' LIMIT 1",
			array($ext_name), __FUNCTION__, __LINE__);

		// Entry found?
		if (SQL_NUMROWS($result) == 1) {
			// Load entry
			$data = SQL_FETCHARRAY($result);
		} // END - if

		// Free result
		SQL_FREERESULT($result);

		// Write cache array
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . '[DB]: ' . $data['ext_active']);
		$GLOBALS['cache_array']['extension']['ext_active'][$ext_name] = $data['ext_active'];
	} else {
		// Extension not active!
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ': Not active!');
		$GLOBALS['cache_array']['extension']['ext_active'][$ext_name] = 'N';
	}

	// Debug message
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',active=' . $data['ext_active']);

	// Is this extension activated? (For admins we always have active extensions...)
	return ($data['ext_active'] == 'Y');
}

// Get version from extensions
function getExtensionVersion ($ext_name, $force = FALSE) {
	// By default no extension is found
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - ENTERED!');
	$data['ext_version'] = 'false';

	// Empty extension name should be fixed!
	if (empty($ext_name)) {
		// Please report this bug!
		reportBug(__FUNCTION__, __LINE__, 'ext_name is empty which is not allowed here.');
	} // END - if

	// Extensions are all inactive during installation
	if (isInstallationPhase()) {
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',force=' . intval($force) . ' - Installation phase detected, returning empty version.');
		return '';
	} // END - if

	// Is the cache written?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - Checking cache ...');
	if (isset($GLOBALS['cache_array']['extension']['ext_version'][$ext_name])) {
		// Load data from cache
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - CACHE!');
		$data['ext_version'] = $GLOBALS['cache_array']['extension']['ext_version'][$ext_name];

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} elseif ((!isCacheInstanceValid()) || (isset($GLOBALS['cache_array']['extension'])) || (!isHtmlOutputMode())) {
		// Load from database
		$result = SQL_QUERY_ESC("SELECT `ext_version` FROM `{?_MYSQL_PREFIX?}_extensions` WHERE `ext_name`='%s' LIMIT 1",
			array($ext_name), __FUNCTION__, __LINE__);
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ': DB - '.SQL_NUMROWS($result).'');

		// Is the extension there?
		if (SQL_NUMROWS($result) == 1) {
			// Load entry
			$data = SQL_FETCHARRAY($result);

			// Set cache
			$GLOBALS['cache_array']['extension']['ext_version'][$ext_name] = $data['ext_version'];
		} elseif (isDebugModeEnabled()) {
			// Not found, may happen while an extension is uninstalled
			logDebugMessage(__FUNCTION__, __LINE__, sprintf("Cannot find extension %s in database!", $ext_name));
		}

		// Free result
		SQL_FREERESULT($result);
	}

	// Extension version should not be invalid
	if (($data['ext_version'] == 'false') && ($force === FALSE)) {
		// Please report this trouble
		reportBug(__FUNCTION__, __LINE__, sprintf("Extension <span class=\"data\">%s</span> has empty version!", $ext_name));
	} // END - if

	// Return result
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_version=' . $data['ext_version']);
	return $data['ext_version'];
}

// Updates a given extension with current extension version to latest version
function updateExtension ($ext_name, $ext_ver, $isDryRun = FALSE, $ignoreDependencies = FALSE) {
	// Only admins are allowed to update extensions
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_ver=' . $ext_ver . ',isDryRun=' . intval($isDryRun) . ',ignoreDependencies=' . intval($ignoreDependencies) . ' - ENTERED!');
	if ((!isAdmin()) || (empty($ext_name))) {
		// Called as non-admin or empty extension
		reportBug(__FUNCTION__, __LINE__, 'Called as non-admin (isAdmin()=' . intval(isAdmin()) . '), or empty extension name. ext_name=' . $ext_name);
	} // END - if

	// Set current SQL name
	setCurrentExtensionName($ext_name);

	// Is this extension update already running?
	if ((isExtensionUpdateRunning($ext_name, $ignoreDependencies)) && ($isDryRun === FALSE)) {
		// This is fine but needs logging ATM
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - already in update phase, all fine.');
		//* BUG: */ reportBug(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - already in update phase, please investigate!');
		return TRUE;
	} // END - if

	// Init arrays
	initExtensionSqls();
	initExtensionNotes();
	initIncludePool('extension');

	// Load extension in test mode
	loadExtension($ext_name, 'test', $ext_ver, isExtensionDryRun());

	// Save version history
	$history = getExtensionVersionHistory();

	// Remove old SQLs array to prevent possible bugs
	initExtensionSqls();

	// Check if version is updated
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, getCurrentExtensionName() . '/' . $ext_name . ':' . getThisExtensionVersion() . '/' . $ext_ver . '/' . intval(is_array($history)));
	if (((getThisExtensionVersion() != $ext_ver) || (isExtensionDryRun())) && (is_array($history))) {
		// Search for starting point (-1 for making 0.0 -> 0.0.0 switch work)
		$start = -1;
		if ($ext_ver != '0.0') {
			$start = array_search($ext_ver, $history);
		} // END - if

		// And load SQL queries in order of version history
		for ($idx = ($start + 1); $idx < count($history); $idx++) {
			// Set extension version
			$GLOBALS['update_ver'][getCurrentExtensionName()] = $history[$idx];

			// Load again...
			loadExtension(getCurrentExtensionName(), 'update', $GLOBALS['update_ver'][getCurrentExtensionName()], isExtensionDryRun());

			// Get all depencies
			$depencies = getExtensionUpdateDependencies();

			// Nothing to apply?
			if (count($depencies) > 0) {
				// Apply all extension depencies
				foreach ($depencies as $ext_depend) {
					// Did we already update/register this?
					if (!isset($GLOBALS['ext_updated'][$ext_depend])) {
						// Set it as current
						setCurrentExtensionName($ext_depend);

						// Mark it as already updated before we update it
						$GLOBALS['ext_updated'][$ext_depend] = TRUE;

						// Is the extension there?
						if (isExtensionInstalled($ext_depend)) {
							// Update another extension first!
							$processResult = updateExtension($ext_depend, getExtensionVersion($ext_depend), isExtensionDryRun(), TRUE);
						} else {
							// Register new extension
							$processResult = registerExtension($ext_depend, NULL, isExtensionDryRun());
						}
					} // END - if
				} // END - foreach

				// Set name back
				setCurrentExtensionName($ext_name);

				// Set extension version here
				setCurrentExtensionVersion($ext_ver);
			} // END - if

			// Add notes
			addExtensionNotes($history[$idx]);
		} // END - for

		// In real-mode execute any existing includes
		if (isExtensionDryRun() === FALSE) {
			$GLOBALS['ext_inc_pool'][getCurrentExtensionName()] = getIncludePool('extension');
			runFilterChain('load_includes', 'extension');
			setIncludePool('extension', $GLOBALS['ext_inc_pool'][getCurrentExtensionName()]);
			unset($GLOBALS['ext_inc_pool'][getCurrentExtensionName()]);
		} // END - if

		// Init these SQLs
		initSqls();
		setSqlsArray(getExtensionSqls());

		// Run SQLs
		runFilterChain('run_sqls', array('dry_run' => isExtensionDryRun(), 'enable_codes' => FALSE));

		if (isExtensionDryRun() === FALSE) {
			// Run filters on success extension update
			runFilterChain('extension_update', getCurrentExtensionName());
		} // END - if
	} // END - if

	//* DEBUG: */logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_ver=' . $ext_ver . ',isDryRun=' . intval($isDryRun) . ',ignoreDependencies=' . intval($ignoreDependencies) . ' - EXIT!');
}

// Output verbose SQL table for extension
function addExtensionVerboseSqlTable ($title = '{--ADMIN_SQLS_EXECUTED_ON_REMOVAL--}') {
	// Empty title?
	if (empty($title)) {
		// Then abort here
		reportBug(__FUNCTION__, __LINE__, 'title is empty.');
	} // END - if

	// Init variables
	$OUT = '';

	// Is there queries?
	if (isVerboseSqlEnabled()) {
		// Are there entries?
		if (countExtensionSqls() > 0) {
			// Init counter
			$idx = 0;
			// Get all SQLs
			foreach (getExtensionSqls() as $sqls) {
				// New array format is recursive
				foreach ($sqls as $sql) {
					// Trim out spaces
					$sql = trim($sql);

					// Output command if set
					if (!empty($sql)) {
						// Prepare output for template
						$content = array(
							'i'   => ($idx + 1),
							'sql' => str_replace(array('{', '}'), array('&#123;', '&#125;'), encodeEntities($sql))
						);

						// Load row template
						$OUT .= loadTemplate('admin_extension_sql_row', TRUE, $content);

						// Count up
						$idx++;
					} // END - if
				} // END - foreach
			} // END - foreach

			// Prepare content for template
			$content = array(
				'title'  => $title,
				'rows'   => $OUT
			);

			// Load main template
			$OUT = loadTemplate('admin_extension_sql_table', TRUE, $content);
		} else {
			// No addional SQL commands to run
			$OUT = displayMessage('{--ADMIN_EXTENSION_VERBOSE_SQLS_404--}', TRUE);
		}
	} // END - if

	// Return output
	return $OUT;
}

// Get extension name from id
function getExtensionName ($ext_id) {
	// Init extension name
	$data['ext_name'] = '';

	// Is cache there?
	if (isset($GLOBALS['cache_array']['extension']['ext_name'][$ext_id])) {
		// Load from cache
		$data['ext_name'] = $GLOBALS['cache_array']['extension']['ext_name'][$ext_id];

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} elseif (!isExtensionActive('cache')) {
		// Load from database
		$result = SQL_QUERY_ESC("SELECT `ext_name` FROM `{?_MYSQL_PREFIX?}_extensions` WHERE `id`=%s LIMIT 1",
			array(bigintval($ext_id)), __FUNCTION__, __LINE__);

		// Is the entry there?
		if (SQL_NUMROWS($result) == 1) {
			// Get the extension's name from database
			$data = SQL_FETCHARRAY($result);
		} // END - if

		// Free result
		SQL_FREERESULT($result);
	}

	// Did we find some extension?
	if (empty($data['ext_name'])) {
		// We should fix these all!
		reportBug(__FUNCTION__, __LINE__, 'ext_name is empty. ext_id=' . $ext_id);
	} // END - if

	// Return the extension name
	return $data['ext_name'];
}

// Get extension id from name
function getExtensionId ($ext_name) {
	// Init id number
	$data['ext_id'] = '0';

	// Is there cache?
	if (isset($GLOBALS['cache_array']['extension']['ext_id'][$ext_name])) {
		// Load from cache
		$data['ext_id'] = $GLOBALS['cache_array']['extension']['ext_id'][$ext_name];

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} else {
		// Load from database
		$result = SQL_QUERY_ESC("SELECT `id` AS `ext_id` FROM `{?_MYSQL_PREFIX?}_extensions` WHERE `ext_name`='%s' LIMIT 1",
			array($ext_name), __FUNCTION__, __LINE__);

		// Is the entry there?
		if (SQL_NUMROWS($result) == 1) {
			// Get the extension's id from database
			$data = SQL_FETCHARRAY($result);
		} // END - if

		// Free result
		SQL_FREERESULT($result);

		// Cache it
		$GLOBALS['cache_array']['extension']['ext_id'][$ext_name] = $data['ext_id'];
	}

	// Return value
	return $data['ext_id'];
}

// Determines whether the given extension name is valid
function isExtensionNameValid ($ext_name) {
	// Is there cache?
	if (!isset($GLOBALS['ext_name_valid'][$ext_name])) {
		// Generate include file name
		$INC = sprintf("inc/extensions/ext-%s.php", $ext_name);

		// Is there a file in inc/extensions/ ?
		$GLOBALS['ext_name_valid'][$ext_name] = isIncludeReadable($INC);
	} // END - if

	// Return result
	return $GLOBALS['ext_name_valid'][$ext_name];
}

// Determines whether the given extension id is valid
function isExtensionIdValid ($ext_id) {
	// Default is nothing valid
	$isValid = FALSE;

	// Check in cache then in database
	if (isset($GLOBALS['cache_array']['extension']['ext_name'][$ext_id])) {
		// Valid!
		$isValid = TRUE;

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} else {
		// Query database
		$isValid = (countSumTotalData($ext_id, 'extensions', 'id', 'id', TRUE) == 1);
	}

	// Return result
	return $isValid;
}

// Activate given extension
function doActivateExtension ($ext_name) {
	// Is the extension installed?
	if (!isExtensionInstalled($ext_name)) {
		// Non-installed extensions cannot be activated
		reportBug(__FUNCTION__, __LINE__, 'Tried to activate non-installed extension ' . $ext_name);
	} // END - if

	// Activate the extension
	SQL_QUERY_ESC("UPDATE `{?_MYSQL_PREFIX?}_extensions` SET `ext_active`='Y' WHERE `ext_name`='%s' LIMIT 1",
		array($ext_name), __FUNCTION__, __LINE__);

	// Then run all queries
	doExtensionSqls(getExtensionId($ext_name), 'activate');
}

// Deactivate given extension
function doDeactivateExtension ($ext_name, $inRebuild = FALSE) {
	// Is the extension installed?
	if (!isExtensionInstalled($ext_name)) {
		// Non-installed extensions cannot be activated
		reportBug(__FUNCTION__, __LINE__, 'Tried to deactivate non-installed extension ' . $ext_name . ',getExtensionMode()=' . getExtensionMode());
	} // END - if

	// Activate the extension
	SQL_QUERY_ESC("UPDATE `{?_MYSQL_PREFIX?}_extensions` SET `ext_active`='N' WHERE `ext_name`='%s' LIMIT 1",
		array($ext_name), __FUNCTION__, __LINE__);

	// Then run all queries
	doExtensionSqls(getExtensionId($ext_name), 'deactivate');

	// Create new task (we ignore the task id here)
	createExtensionDeactivationTask($ext_name);

	// Do not rebuild cache if it is already been rebuild
	if ($inRebuild === FALSE) {
		// Rebuild cache
		rebuildCache('extension', 'extension');
	} // END - if

	// Notify the admin
	sendAdminNotification(
		'{--ADMIN_EXTENSION_DEACTIVATED_SUBJECT--}',
		'admin_extension_deactivated',
		array('ext_name' => $ext_name)
	);
}

// Creates a new task for updated extension
function createExtensionUpdateTask ($adminId, $ext_name, $ext_ver, $notes) {
	// Create subject line
	$subject = '[UPDATE-' . $ext_name . '-' . $ext_ver . ':] {--ADMIN_UPDATE_EXTENSION_SUBJECT--}';

	// Get task id
	$taskId = determineTaskIdBySubject($subject);

	// Is the extension there?
	if (isExtensionInstalled($ext_name)) {
		// Check if task is not there
		if ($taskId == '0') {
			// Create extension update-task
			$taskId = createNewTask($subject, $notes, 'EXTENSION_UPDATE', 0, $adminId);
		} // END - if
	} else {
		// Extension not there! :-(
		reportBug(__FUNCTION__, __LINE__, sprintf("Extension <span class=\"data\">%s</span> not found but should be updated?", $ext_name));
	}

	// Return task id
	return $taskId;
}

// Creates a new task for newly installed extension
function createNewExtensionTask ($ext_name) {
	// Generate subject line
	$subject = sprintf("[%s:]", $ext_name);

	// Get task id
	$taskId = determineTaskIdBySubject($subject);

	// Not installed and do we have created a task for the admin?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',taskId[' . gettype($taskId) . ']=' . $taskId);
	if (((is_null($taskId)) || ($taskId == '0')) && (!isExtensionInstalled($ext_name))) {
		// Set default message if ext-foo is missing
		$message = '{%message,ADMIN_EXTENSION_TEXT_FILE_MISSING=' . $ext_name . '%}';

		// Template file
		$FQFN = sprintf("%stemplates/%s/html/ext/ext_%s.tpl",
			getPath(),
			getLanguage(),
			$ext_name
		);

		// Load text for task if found
		if (isFileReadable($FQFN)) {
			// Load extension's description template (but do not compile the code)
			$message = loadTemplate('ext_' . $ext_name, TRUE, array(), FALSE);
		} else {
			// Write this in debug.log as well
			logDebugMessage(__FUNCTION__, __LINE__, $message);
		}

		// Task not created so it's a brand-new extension which we need to register and create a task for!
		$taskId = createNewTask($subject, $message, 'EXTENSION', 0, getCurrentAdminId(), FALSE);
	} // END - if

	// Return task id
	return $taskId;
}

// Creates a task for automatically deactivated (deprecated) extension
function createExtensionDeactivationTask ($ext_name) {
	// Create subject line
	$subject = sprintf("[%s:] %s", $ext_name, '{--ADMIN_TASK_EXTENSION_DEACTIVATED_SUBJECT--}');

	// Get task id
	$taskId = determineTaskIdBySubject($subject);

	// Not installed and do we have created a task for the admin?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',taskId[' . gettype($taskId) . ']=' . $taskId);
	if (((is_null($taskId)) || ($taskId == '0')) && (isExtensionInstalled($ext_name))) {
		// Task not created so add it
		$taskId = createNewTask($subject, SQL_ESCAPE(loadTemplate('task_EXTENSION_deactivated', TRUE, $ext_name)), 'EXTENSION_DEACTIVATION');
	} // END - if

	// Return task id
	return $taskId;
}

// Determines the task id for given extension
function determineExtensionTaskId ($ext_name) {
	// Is it installation phase and table task_system is not found?
	if ((isInstallationPhase()) && (!ifSqlTableExists('task_system'))) {
		// Then return NULL (not found)
		return NULL;
	} // END - if

	// Default is not found
	$data['task_id'] = NULL;

	// Search for extension task's id
	$result = SQL_QUERY_ESC("SELECT `id` AS task_id FROM `{?_MYSQL_PREFIX?}_task_system` WHERE `task_type`='EXTENSION' AND `subject`='[%s:]' LIMIT 1",
		array($ext_name), __FUNCTION__, __LINE__);

	// Entry found?
	if (SQL_NUMROWS($result) == 1) {
		// Task found so load task's id and register extension...
		$data = SQL_FETCHARRAY($result);
	} // END - if

	// Free result
	SQL_FREERESULT($result);

	// Return it
	return $data['task_id'];
}

// Determines the task id for given subject
function determineTaskIdBySubject ($subject) {
	// Default is not found
	$data['task_id'] = '0';

	// Search for task id
	$result = SQL_QUERY_ESC("SELECT `id` AS task_id FROM `{?_MYSQL_PREFIX?}_task_system` WHERE `subject` LIKE '%s%%' LIMIT 1",
		array($subject), __FUNCTION__, __LINE__);

	// Entry found?
	if (SQL_NUMROWS($result) == 1) {
		// Task found so load task's id and register extension...
		$data = SQL_FETCHARRAY($result);
	} // END - if

	// Free result
	SQL_FREERESULT($result);

	// Return it
	return $data['task_id'];
}

// Add updates notes for given version
function addExtensionNotes ($ext_ver) {
	// Init notes/content
	$out = '';
	$content = array();

	// Is do we have verbose output enabled?
	if ((!isExtensionActive('sql_patches')) || (isVerboseSqlEnabled())) {
		// Update notes found?
		if ((isExtensionUpdateNoteSet($ext_ver)) && ($ext_ver != '0.0.0')) {
			// Update notes found
			$content = array(
				'ver'   => $ext_ver,
				'notes' => getExtensionUpdateNotes($ext_ver)
			);

			// Reset them
			setExtensionUpdateNotes('', $ext_ver);
		} elseif ($ext_ver == '0.0.0') {
			// Is the extension productive?
			if (isExtensionProductive(getCurrentExtensionName())) {
				// Initial release
				$content = array(
					'ver'   => $ext_ver,
					'notes' => '{--ADMIN_EXTENSION_INITIAL_RELEASE--}'
				);
			} else {
				// Not productive
				$content = array(
					'ver'   => $ext_ver,
					'notes' => '{--ADMIN_EXTENSION_DEVELOPER_RELEASE--}'
				);
			}
		} else {
			// No update notes found
			$content = array(
				'ver'   => $ext_ver,
				'notes' => '{--ADMIN_EXTENSION_UPDATE_NOTICES_404--}'
			);
		}

		// Load template
		$out = loadTemplate('admin_extension_notes', TRUE, $content);
	} // END - if

	// Add the notes
	appendExtensionNotes($out);
}

// Getter for CSS files array
function getExtensionCssFiles () {
	// By default no additional CSS files are found
	$cssFiles = array();

	// Is the array there?
	if (isset($GLOBALS['css_files'])) {
		// Then use it
		$cssFiles = $GLOBALS['css_files'];
	} // END - if

	// Return array
	return $cssFiles;
}

// Init CSS files array
function initExtensionCssFiles () {
	// Simply init it
	$GLOBALS['css_files'] = array();
}

// Add new entry
function addExtensionCssFile ($file) {
	// Is the array there?
	if (!isset($GLOBALS['css_files'])) {
		// Then auto-init them
		initExtensionCssFiles();
	} // END - if

	// Add the entry
	array_push($GLOBALS['css_files'], $file);
}

// Setter for EXT_ALWAYS_ACTIVE flag
function setExtensionAlwaysActive ($active) {
	$GLOBALS['ext_always_active'][getCurrentExtensionName()] = (string) $active;
}

// Getter for EXT_ALWAYS_ACTIVE flag
function getThisExtensionAlwaysActive () {
	return $GLOBALS['ext_always_active'][getCurrentExtensionName()];
}

// Checks whether the current extension is always active
function isThisExtensionAlwaysActive () {
	return (getThisExtensionAlwaysActive() == 'Y');
}

// Setter for EXT_VERSION flag
function setThisExtensionVersion ($ext_version) {
	$GLOBALS['ext_version'][getCurrentExtensionName()] = (string) $ext_version;
}

// Getter for EXT_VERSION flag
function getThisExtensionVersion () {
	return $GLOBALS['ext_version'][getCurrentExtensionName()];
}

// Setter for EXT_DEPRECATED flag
function setExtensionDeprecated ($deprecated) {
	$GLOBALS['ext_deprecated'][getCurrentExtensionName()] = (string) $deprecated;
}

// Getter for EXT_DEPRECATED flag
function isExtensionDeprecated ($ext_name = NULL) {
	// Default is from current (NULL) extension
	$isDeprecated = ($GLOBALS['ext_deprecated'][getCurrentExtensionName()] == 'Y');

	// Is ext_name set?
	if (!is_null($ext_name)) {
		// Then use it instead
		$isDeprecated = ((isset($GLOBALS['ext_deprecated'][$ext_name])) && ($GLOBALS['ext_deprecated'][$ext_name] == 'Y'));
	} // END - if

	// Return it
	return $isDeprecated;
}

// Setter for EXT_UPDATE_DEPENDS flag
function addExtensionDependency ($updateDepends) {
	// Is the update depency empty? (NEED TO BE FIXED!)
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . '/' . $updateDepends . ',extensionMode=' . getExtensionMode() . ' - ENTERED!');
	if (empty($updateDepends)) {
		// Please report this bug!
		reportBug(__FUNCTION__, __LINE__, 'updateDepends is empty: currentExtension=' . getCurrentExtensionName());
	} // END - if

	// Is it not yet added?
	if ((isset($updateDepends, $GLOBALS['ext_running_updates'][getCurrentExtensionName()])) && (in_array($updateDepends, getExtensionUpdatesRunning()))) {
		/*
		 * Double-adding happens when the extension and an update of the same
		 * extension requires the same other extension again.
		 */
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'updateDepends=' . $updateDepends . ',extensionMode=' . getExtensionMode() . ',currentExtension=' . getCurrentExtensionName() . ' - called twice.');
		return;
	} // END - if

	// Add it to the list of extension update depencies map
	array_push($GLOBALS['ext_update_depends'][getCurrentExtensionName()], $updateDepends);

	// Init array
	if ((!isset($GLOBALS['ext_running_updates'][getCurrentExtensionName()])) || (!is_array($GLOBALS['ext_running_updates'][getCurrentExtensionName()]))) {
		$GLOBALS['ext_running_updates'][getCurrentExtensionName()] = array();
	} // END - if

	// Remember it in the list of running updates
	array_push($GLOBALS['ext_running_updates'][getCurrentExtensionName()], $updateDepends);
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . '/' . $updateDepends . ',extensionMode=' . getExtensionMode() . ' - EXIT!');
}

// Getter for running updates
function getExtensionUpdatesRunning () {
	return $GLOBALS['ext_running_updates'][getCurrentExtensionName()];
}

// Checks whether the given extension registration is in progress
function isExtensionRegistrationRunning ($ext_name) {
	// Simply check it
	$isRunning = ((isset($GLOBALS['ext_register_running'])) && (in_array($ext_name, $GLOBALS['ext_register_running'])));

	// Return it
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ', isRunning=' . intval($isRunning));
	return $isRunning;
}

// Init EXT_UPDATE_DEPENDS flag
function initExtensionUpdateDependencies () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ' - ENTERED!');

	// Init update depency map automatically if not found
	if (isExtensionUpdateDependenciesInitialized()) {
		// We need these bug reports as well...
		reportBug(__FUNCTION__, __LINE__, '() is called twice: currName=' . getCurrentExtensionName());
	} // END - if

	$GLOBALS['ext_update_depends'][getCurrentExtensionName()] = array();

	// Init running updates array
	initExtensionRuningUpdates();

	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ' - EXIT!');
}

// Adds an extension as "registration in progress"
function addExtensionRunningRegistration ($ext_name) {
	// Is it running?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Registration in progress: ext_name=' . $ext_name . ' - ENTERED!');
	if (isExtensionRegistrationRunning($ext_name)) {
		// This is really bad and should not be quietly ignored
		reportBug(__FUNCTION__, __LINE__, '() already called! ext_name=' . $ext_name);
	} // END - if

	// Then add it!
	array_push($GLOBALS['ext_register_running'], $ext_name);
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Registration in progress: ext_name=' . $ext_name . ' - EXIT!');
}

// Checks whether EXT_UPDATE_DEPENDS is initialized
function isExtensionUpdateDependenciesInitialized () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
	return (isset($GLOBALS['ext_update_depends'][getCurrentExtensionName()]));
}

// Checks whether an update is already running for given extension
function isExtensionUpdateRunning ($ext_name, $ignoreDependencies = FALSE) {
	// Current and given extensions means whole array
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName() . ',ext_name=' . $ext_name . ',ignoreDependencies=' . intval($ignoreDependencies) . ' - ENTERED!');
	if ($ext_name == getCurrentExtensionName()) {
		// Default is not found
		$isRunning = FALSE;

		// Walk through whole array
		foreach ($GLOBALS['ext_running_updates'] as $ext1 => $depends) {
			// Is it found?
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext1=' . $ext1 . ',ext_name=' . $ext_name . ',depends=' . print_r($depends, TRUE));
			if (($ext1 == $ext_name) || ((in_array($ext_name, $depends)) && ($ignoreDependencies === FALSE))) {
				// Found
				$isRunning = TRUE;
				//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext1=' . $ext1 . ',ext_name=' . $ext_name . ',isRunning=true - FOUND!');
				break;
			} // END - if
		} // END - foreach

		// Return result
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName() . ',ext_name=' . $ext_name . ',ignoreDependencies=' . intval($ignoreDependencies) . ', isRunning=' . intval($isRunning) . ' - ALT-EXIT!');
		return $isRunning;
	} // END - if

	// Simply check it
	$isRunning = ((isExtensionUpdateDependenciesInitialized()) && (in_array($ext_name, getExtensionRunningUpdates())));

	// Return it
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName() . ',ext_name=' . $ext_name . ',ignoreDependencies=' . intval($ignoreDependencies) . ', isRunning=' . intval($isRunning) . ' - EXIT!');
	return $isRunning;
}

// Initializes the list of running updates
function initExtensionRuningUpdates () {
	// Auto-init ext_running_updates
	if (!isset($GLOBALS['ext_running_updates'])) {
		$GLOBALS['ext_running_updates'] = array();
		$GLOBALS['ext_register_running'] = array();
	} // END - if
}

// Getter for EXT_UPDATE_DEPENDS flag
function getExtensionUpdateDependencies () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
	return $GLOBALS['ext_update_depends'][getCurrentExtensionName()];
}

// Getter for next iterator depency
function getExtensionUpdateDependenciesIterator () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
	return ($GLOBALS['ext_update_depends'][getCurrentExtensionName()][getExtensionUpdateIterator()]);
}

// Counter for extension update depencies
function countExtensionUpdateDependencies () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . '=' . count($GLOBALS['ext_update_depends'][getCurrentExtensionName()]));
	return count($GLOBALS['ext_update_depends'][getCurrentExtensionName()]);
}

// Removes given extension from update denpency list
function removeExtensionDependency ($ext_name) {
	// Look it up
	$key = array_search($ext_name, getExtensionUpdateDependencies());

	// Debug message
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',key[' . gettype($key) . ']=' . $key);

	// Is it valid?
	if ($key !== FALSE) {
		// Then remove it
		unset($GLOBALS['ext_update_depends'][getCurrentExtensionName()][$key]);

		// And sort the array
		ksort($GLOBALS['ext_update_depends'][getCurrentExtensionName()]);
	} // END - if
}

// Init iterator for update depencies
function initExtensionUpdateIterator () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
	$GLOBALS['ext_depend_iterator'][getCurrentExtensionName()] = '0';
}

// Getter for depency iterator
function getExtensionUpdateIterator () {
	// Auto-init iterator
	if (!isset($GLOBALS['ext_depend_iterator'][getCurrentExtensionName()])) {
		// Initialize update iterator
		initExtensionUpdateIterator();
	} // END - if

	// Return it
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . '=' . $GLOBALS['ext_depend_iterator'][getCurrentExtensionName()]);
	return $GLOBALS['ext_depend_iterator'][getCurrentExtensionName()];
}

// Increments the update iterator
function incrementExtensionUpdateIterator () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
	$GLOBALS['ext_depend_iterator'][getCurrentExtensionName()]++;
}

// Setter for EXT_REPORTS_FAILURE flag
function enableExtensionReportingFailure ($reportsFailure = FALSE) {
	$GLOBALS['ext_reports_failure'] = (bool) $reportsFailure;
}

// Getter for EXT_REPORTS_FAILURE flag
function isExtensionReportingFailure () {
	return $GLOBALS['ext_reports_failure'];
}

// Setter for EXT_VER_HISTORY flag
function setExtensionVersionHistory ($versionHistory) {
	$GLOBALS['ext_ver_history'][getCurrentExtensionName()] = (array) $versionHistory;
}

// Getter for EXT_VER_HISTORY array
function getExtensionVersionHistory () {
	// Is it set?
	if (!isset($GLOBALS['ext_ver_history'][getCurrentExtensionName()])) {
		// Then abort here to a avoid an ugly "Undefined index" error
		reportBug(__FUNCTION__, __LINE__, 'Extension ext-' . getCurrentExtensionName() . ' has no history set! Is this extension empty?');
	} // END - if

	// Return the history
	return $GLOBALS['ext_ver_history'][getCurrentExtensionName()];
}

// Setter for EXT_UPDATE_NOTICES
function setExtensionUpdateNotes ($updateNotes, $ext_ver = '') {
	//
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()=' . getCurrentExtensionName() . ',getExtensionMode()=' . getExtensionMode() . ',ext_ver=' . $ext_ver . '/' . getCurrentExtensionVersion() . ',updateNotes(length)=' . strlen($updateNotes));
	if (empty($ext_ver)) {
		$GLOBALS['ext_update_notes'][getCurrentExtensionName()][getCurrentExtensionVersion()] = (string) $updateNotes;
	} else {
		$GLOBALS['ext_update_notes'][getCurrentExtensionName()][$ext_ver] = (string) $updateNotes;
	}
}

// Getter for EXT_UPDATE_NOTICES
function getExtensionUpdateNotes ($ext_ver) {
	return $GLOBALS['ext_update_notes'][getCurrentExtensionName()][$ext_ver];
}

// Checks if ext_update_notes is set
function isExtensionUpdateNoteSet ($ext_ver) {
	return isset($GLOBALS['ext_update_notes'][getCurrentExtensionName()][$ext_ver]);
}

// Init extension notice
function initExtensionNotes ($force = FALSE) {
	// Is it already initialized?
	if (($force === FALSE) && (isset($GLOBALS['ext_notes'][getCurrentExtensionName()]))) {
		// This is mostly not wanted, so please report it
		reportBug(__FUNCTION__, __LINE__, 'ext_notes already set for extension ' . getCurrentExtensionName());
	} // END - if

	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()=' . getCurrentExtensionName());
	$GLOBALS['ext_notes'][getCurrentExtensionName()] = '';
}

// Append extension notice
function appendExtensionNotes ($notes) {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()=' . getCurrentExtensionName() . ', notes(length)=' . strlen($notes));
	$GLOBALS['ext_notes'][getCurrentExtensionName()] .= (string) trim($notes);
}

// Getter for extension notes
function getExtensionNotes () {
	return $GLOBALS['ext_notes'][getCurrentExtensionName()];
}

// Setter for current extension name
function setCurrentExtensionName ($ext_name) {
	$GLOBALS['curr_extension_name'] = (string) trim($ext_name);
}

// Getter for current extension name
function getCurrentExtensionName () {
	if (!isset($GLOBALS['curr_extension_name'])) {
		// Not set!
		reportBug(__FUNCTION__, __LINE__, 'curr_extension_name not initialized. Please execute initExtensionSqls() before calling this function.');
	} // END - if

	// Return it
	return $GLOBALS['curr_extension_name'];
}

// Init SQLs array for current extension
function initExtensionSqls ($force = FALSE) {
	// Auto-init the array or if forced
	if (($force === TRUE) || (!isset($GLOBALS['ext_sqls'][getCurrentExtensionName()]))) {
		// Set the array
		$GLOBALS['ext_sqls'][getCurrentExtensionName()] = array();

		// Initialize the generic array
		initSqls();
	} // END - if
}

// Adds SQLs to the SQLs array but "assigns" it with current extension name
function addExtensionSql ($sql) {
	// Is is the array there?
	if ((!isset($GLOBALS['ext_sqls'][getCurrentExtensionName()][getCurrentExtensionVersion()])) || (!is_array($GLOBALS['ext_sqls'][getCurrentExtensionName()][getCurrentExtensionVersion()]))) {
		// Init array
		$GLOBALS['ext_sqls'][getCurrentExtensionName()][getCurrentExtensionVersion()] = array();
	} // END - if

	// Is the SQL statement empty?
	if (empty($sql)) {
		/*
		 * Abort here as this may happen if getExtensionMode() is 'activate' or
		 * 'deactivate'. This means that for 'mode' are no SQL statements
		 * specified.
		 */
		return;
	} // END - if

	// Add it
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ',ext_version=' . getCurrentExtensionVersion() . ',sql=' . $sql);
	array_push($GLOBALS['ext_sqls'][getCurrentExtensionName()][getCurrentExtensionVersion()], $sql);
}

// Getter for SQLs array for current extension
function getExtensionSqls () {
	// Output debug backtrace if not found (SHOULD NOT HAPPEN!)
	if (!isset($GLOBALS['ext_sqls'][getCurrentExtensionName()])) {
		// Not found, should not happen
		reportBug(__FUNCTION__, __LINE__, sprintf("ext_sqls is empty, current extension: %s",
			getCurrentExtensionName()
		));
	} // END - if

	// Return the array
	return $GLOBALS['ext_sqls'][getCurrentExtensionName()];
}

// Count SQLs for current extension
function countExtensionSqls () {
	// Output debug backtrace if not found (SHOULD NOT HAPPEN!)
	if (!isset($GLOBALS['ext_sqls'][getCurrentExtensionName()])) {
		// Not found, should not happen
		reportBug(__FUNCTION__, __LINE__, sprintf("ext_sqls is empty, current extension: %s",
			getCurrentExtensionName()
		));
	} // END - if

	// Count them all
	return count($GLOBALS['ext_sqls'][getCurrentExtensionName()]);
}

// Removes SQLs for current extension
function unsetExtensionSqls () {
	unset($GLOBALS['ext_sqls'][getCurrentExtensionName()]);
}

// Auto-initializes the removal list
function initExtensionRemovalList () {
	// Is the remove list there?
	if (!isset($GLOBALS['ext_update_remove'])) {
		// Then create it
		$GLOBALS['ext_update_remove'] = array();
	} // END - if
}

// Checks whether the current extension is on the removal list
function isExtensionOnRemovalList () {
	// Init removal list
	initExtensionRemovalList();

	// Is it there?
	return (in_array(getCurrentExtensionName(), $GLOBALS['ext_update_remove']));
}

// Adds the current extension to the removal list
function addCurrentExtensionToRemovalList () {
	// Simply add it
	array_push($GLOBALS['ext_update_remove'], getCurrentExtensionName());
}

// Getter for removal list
function getExtensionRemovalList () {
	// Return the removal list
	return $GLOBALS['ext_update_remove'];
}

// Redirects if the provided extension is not installed
function redirectOnUninstalledExtension ($ext_name) {
	// So is the extension there?
	if ((!isExtensionInstalled($ext_name)) || (!isExtensionActive($ext_name))) {
		// Redirect to index
		redirectToUrl('modules.php?module=index&amp;code=' . getCode('EXTENSION_PROBLEM') . '&amp;ext=' . $ext_name);
	} // END - if
}

// Filter for initialization of all extensions by loading them in 'init' mode
function FILTER_INIT_EXTENSIONS () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ENTERED!');
	// Init notification pool
	initIncludePool('notify');

	// Are there some entries?
	if (isset($GLOBALS['cache_array']['extension']['ext_name'])) {
		// Load all found extensions if found
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'CACHE - START!');
		foreach ($GLOBALS['cache_array']['extension']['ext_name'] as $key => $ext_name) {
			// Load it
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - START');
			loadExtension($ext_name, 'init', getExtensionVersion($ext_name));
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - END');
		} // END - foreach
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'CACHE - END!');
	} // END - if

	// Run any notifications
	runFilterChain('load_includes', 'notify');

	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'EXIT!');
}

// Setter for extension mode
function setExtensionMode ($ext_mode) {
	$GLOBALS['ext_mode'] = (string) $ext_mode;
}

// Getter for extension mode
function getExtensionMode () {
	return $GLOBALS['ext_mode'];
}

// Setter for dry-run
function enableExtensionDryRun ($isDryRun = TRUE) {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()='.getCurrentExtensionName().',isDryRun='.intval($isDryRun));
	$GLOBALS['ext_isDryRun'] = (bool) $isDryRun;
}

// Getter for dry-run
function isExtensionDryRun () {
	return $GLOBALS['ext_isDryRun'];
}

// Setter for current extension version
function setCurrentExtensionVersion ($ext_ver) {
	// ext_ver should never be empty in other modes than 'test'
	if ((empty($ext_ver)) && (getExtensionMode() != 'test')) {
		// Please report all these messages
		reportBug(__FUNCTION__, __LINE__, 'ext_ver is empty. Current extension name: ' . getCurrentExtensionName() . ', mode=' . getExtensionMode());
	} // END - if

	// Add version
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ', ext_ver[' . gettype($ext_ver) . ']=' . $ext_ver);
	$GLOBALS['ext_current_version'][getCurrentExtensionName()] = (string) $ext_ver;
}

// Getter for current extension version
function getCurrentExtensionVersion () {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ', ext_ver=' . $GLOBALS['ext_current_version'][getCurrentExtensionName()]);
	return $GLOBALS['ext_current_version'][getCurrentExtensionName()];
}

// Remove the extension from cache array
function removeExtensionFromArray () {
	// "Cache" this name
	$ext_name = getCurrentExtensionName();

	// Now loop through the whole cache
	foreach ($GLOBALS['cache_array']['extension'] as $cacheName => $cacheArray) {
		// Is it an element?
		if (isset($cacheArray[$ext_name])) {
			// Array element
			unset($cacheArray[$ext_name]);
			$GLOBALS['cache_array']['extension'][$cacheName] = $cacheArray;
		} else {
			// Maybe in array?
			$key = array_search($ext_name, $cacheArray);

			// Is it there?
			if ($key !== FALSE) {
				// Found, so remove it
				unset($cacheArray[$key]);
				$GLOBALS['cache_array']['extension'][$cacheName] = $cacheArray;
			} // END - if
		}
	} // END - foreach

	// Remove from other caches as well
	unset($GLOBALS['ext_is_installed'][$ext_name]);
	unset($GLOBALS['loaded_extension'][$ext_name]);
}

// "Getter" for 'extension has a CSS file' (with same name, of course)
function getExtensionHasCss () {
	// Is there cache?
	if (!isset($GLOBALS[__FUNCTION__][getCurrentExtensionName()][getCurrentTheme()])) {
		// Construct FQFN for check
		$FQFN = sprintf("%stheme/%s/css/%s.css",
			getPath(),
			getCurrentTheme(),
			getCurrentExtensionName()
		);

		// Is it there?
		$GLOBALS[__FUNCTION__][getCurrentExtensionName()][getCurrentTheme()] = convertBooleanToYesNo(isFileReadable($FQFN));
	} // END - if

	// Return it
	return $GLOBALS[__FUNCTION__][getCurrentExtensionName()][getCurrentTheme()];
}

// Checks whether the given extension has a language file
function ifExtensionHasLanguageFile ($ext_name) {
	// Is there cache?
	if (isset($GLOBALS['cache_array']['extension']['ext_lang'][$ext_name])) {
		// Count cache hits
		incrementStatsEntry('cache_hits');
	} else {
		// Determine it and put it in cache
		$GLOBALS['cache_array']['extension']['ext_lang'][$ext_name] = convertBooleanToYesNo(isLanguageIncludeReadable($ext_name));
	}

	// Return result
	return ($GLOBALS['cache_array']['extension']['ext_lang'][$ext_name] == 'Y');
}

// Load current extension's include file
function loadCurrentExtensionInclude () {
	// Is it readable?
	if (!isExtensionIncludeReadable()) {
		// Not readable
		reportBug(__FUNCTION__, __LINE__, 'Extension ' . getCurrentExtensionName() . ' should be loaded, but is not readable.');
	} // END - if

	// Generate INC name
	$INC = sprintf("inc/extensions/ext-%s.php", getCurrentExtensionName());

	// Load it
	loadInclude($INC);
}

// Checks whether an extension is readable
function isExtensionIncludeReadable ($ext_name = '') {
	// If empty, use current
	if (empty($ext_name)) {
		$ext_name = getCurrentExtensionName();
	} // END - if

	// Array found?
	if (!isset($GLOBALS['ext_inc_readable'][$ext_name])) {
		// Generate INC name
		$INC = sprintf("inc/extensions/ext-%s.php", getCurrentExtensionName());

		// Is it readable?
		$GLOBALS['ext_inc_readable'][$ext_name] = isIncludeReadable($INC);
	} // END - if

	// Return result
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',realable='.intval($GLOBALS['ext_inc_readable'][$ext_name]));
	return $GLOBALS['ext_inc_readable'][$ext_name];
}

// Checks if an extension's function file is readable
function isExtensionFunctionFileReadable ($ext_name) {
	// Is cache there?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name);
	if (isset($GLOBALS['cache_array']['extension']['ext_func'][$ext_name])) {
		// Just count cache hits
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_func=' . $GLOBALS['cache_array']['extension']['ext_func'][$ext_name] .' - CACHE!');
		incrementStatsEntry('cache_hits');
	} else {
		// Construct IFN for functions file
		$funcsInclude = sprintf("inc/libs/%s_functions.php", $ext_name);

		// Is this include there?
		$isIncludeFound = ((isFileReadable($funcsInclude)) && (!isExtensionLibraryLoaded($ext_name)) && (getExtensionMode() == 'test'));

		// And put in cache, converted
		$GLOBALS['cache_array']['extension']['ext_func'][$ext_name] = convertBooleanToYesNo($isIncludeFound);
	}

	// Return result
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_func=' . $GLOBALS['cache_array']['extension']['ext_func'][$ext_name]);
	return ($GLOBALS['cache_array']['extension']['ext_func'][$ext_name] == 'Y');
}

// Adds a CREATE TABLE statement if the requested table is not there
function addCreateTableSql ($tableName, $sql, $comment) {
	// Is the table not there?
	if (!ifSqlTableExists($tableName)) {
		// Is not found, so add it
		addExtensionSql('CREATE TABLE
	`{?_MYSQL_PREFIX?}_' . $tableName . '` (' . $sql . ')
ENGINE = {?_TABLE_TYPE?}
CHARACTER SET utf8
COLLATE utf8_general_ci
COMMENT ' . chr(39) . $comment . chr(39));
	} else {
		// Is already there
		logDebugMessage(__FUNCTION__, __LINE__, 'The table ' . $tableName . ' is already created.');
	}
}

// Adds a DROP TABLE statement if the requested tabled is there
function addDropTableSql ($tableName) {
	// Is the table there?
	if (ifSqlTableExists($tableName)) {
		/*
		 * Then add it, non-existing tables can be ignored because it will
		 * happen with every newly installed extension.
		 */
		addExtensionSql('DROP TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '`');

		// Mark it as gone
		$GLOBALS['ifSqlTableExists'][$tableName] = FALSE;
	} // END - if
}

// Adds a RENAME TABLE stament if 'from' table exist and 'to' table not
function addRenameTableSql ($fromTable, $toTable) {
	// Make sure both are not the same
	assert($fromTable != $toTable);

	// Is renaming required?
	if ((ifSqlTableExists($fromTable)) && (!ifSqlTableExists($toTable))) {
		// Add it
		addExtensionSql('RENAME TABLE `{?_MYSQL_PREFIX?}_' . $fromTable . '` TO `{?_MYSQL_PREFIX?}_' . $toTable . '`');

		// Mark both tables
		$GLOBALS['ifSqlTableExists'][$fromTable] = FALSE;
		$GLOBALS['ifSqlTableExists'][$toTable]   = TRUE;
	} // END - if
}

// Adds an admin menu to the SQL queue of the menu entry is not found
function addAdminMenuSql ($action, $what, $title, $descr, $sort) {
	// Now check if this menu is there
	if (!isMenuActionValid('admin', $action, $what)) {
		// Is what null?
		if (is_null($what)) {
			// Add main menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_admin_menu` (`action`, `what`, `title`, `descr`, `sort`) VALUES ('%s',NULL,'%s','%s',%s)",
				$action,
				$title,
				$descr,
				bigintval($sort)
			);
		} else {
			// Add sub menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_admin_menu` (`action`, `what`, `title`, `descr`, `sort`) VALUES ('%s','%s','%s','%s',%s)",
				$action,
				$what,
				$title,
				$descr,
				bigintval($sort)
			);
		}

		// Add it to the queue
		addExtensionSql($sql);
	} elseif (isDebugModeEnabled()) {
		// Double menus should be located and fixed!
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("Double admin menu action=%s,what=%s,title=%s detected.", $action, $what, $title));
	}
}

// Adds a guest menu to the SQL queue if the menu entry is not found
function addGuestMenuSql ($action, $what, $title, $sort) {
	// Now check if this menu is there
	if (!isMenuActionValid('guest', $action, $what)) {
		// Is what null?
		if (is_null($what)) {
			// Add main menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_guest_menu` (`action`, `what`, `title`, `visible`, `locked`, `sort`) VALUES ('%s',NULL,'%s','N','Y',%s)",
				$action,
				$title,
				bigintval($sort)
			);
		} else {
			// Add sub menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_guest_menu` (`action`, `what`, `title`, `visible`, `locked`, `sort`) VALUES ('%s','%s','%s','N','Y',%s)",
				$action,
				$what,
				$title,
				bigintval($sort)
			);
		}

		// Add it to the queue
		addExtensionSql($sql);
	} elseif (isDebugModeEnabled()) {
		// Double menus should be located and fixed!
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("Double guest menu action=%s,what=%s,title=%s detected.", $action, $what, $title));
	}
}

// Adds a member menu to the SQL queue if the menu entry is not found
function addMemberMenuSql ($action, $what, $title, $sort) {
	// Now check if this menu is there
	if (!isMenuActionValid('member', $action, $what)) {
		// Is what null?
		if (is_null($what)) {
			// Add main menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_member_menu` (`action`, `what`, `title`, `visible`, `locked`, `sort`) VALUES ('%s',NULL,'%s','N','Y',%s)",
				$action,
				$title,
				bigintval($sort)
			);
		} else {
			// Add sub menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_member_menu` (`action`, `what`, `title`, `visible`, `locked`, `sort`) VALUES ('%s','%s','%s','N','Y',%s)",
				$action,
				$what,
				$title,
				bigintval($sort)
			);
		}

		// Add it to the queue
		addExtensionSql($sql);
	} elseif (isDebugModeEnabled()) {
		// Double menus should be located and fixed!
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("Double member menu action=%s,what=%s,title=%s detected.", $action, $what, $title));
	}
}

// Adds a sponsor menu to the SQL queue if the menu entry is not found
function addSponsorMenuSql ($action, $what, $title, $active, $sort) {
	// Now check if this menu is there, if no ext-sponsor is installed all is not yet added
	if ((!isExtensionInstalled('sponsor')) || (!isMenuActionValid('sponsor', $action, $what))) {
		// Is what null?
		if (is_null($what)) {
			// Add main menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_sponsor_menu` (`action`, `what`, `title`, `active`, `sort`) VALUES ('%s',NULL,'%s','%s',%s)",
				$action,
				$title,
				$active,
				bigintval($sort)
			);
		} else {
			// Add sub menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_sponsor_menu` (`action`, `what`, `title`, `active`, `sort`) VALUES ('%s','%s','%s','%s',%s)",
				$action,
				$what,
				$title,
				$active,
				bigintval($sort)
			);
		}

		// Add it to the queue
		addExtensionSql($sql);
	} elseif (isDebugModeEnabled()) {
		// Double menus should be located and fixed!
		logDebugMessage(__FUNCTION__, __LINE__, sprintf("Double sponsor menu action=%s,what=%s,title=%s,active=%s detected.", $action, $what, $title, $active));
	}
}

// Add ALTER TABLE `foo` ADD sql if not found
function addExtensionAddTableColumnSql ($tableName, $columnName, $columnSql) {
	// Is the column there?
	if (!ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_' . $tableName, $columnName)) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` ADD `' . $columnName . '` ' . $columnSql);
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',columnName=' . $columnName . ',columnSql=' . $columnSql . ': does already exist.');
	}
}

// Add ALTER TABLE `foo` ADD INDEX sql if not found
function addExtensionAddTableIndexSql ($tableName, $indexName, $columnSql) {
	// Is the column there?
	if (!ifSqlTableIndexExist('{?_MYSQL_PREFIX?}_' . $tableName, $indexName)) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` ADD INDEX `' . $indexName . '` ' . $columnSql);
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',indexName=' . $indexName . ',columnSql=' . $columnSql . ': does already exist.');
	}
}

// Add ALTER TABLE `foo` ADD UNIQUE INDEX sql if not found
function addExtensionAddTableUniqueSql ($tableName, $indexName, $columnSql) {
	// Is the column there?
	if (!ifSqlTableIndexExist('{?_MYSQL_PREFIX?}_' . $tableName, $indexName)) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` ADD UNIQUE INDEX `' . $indexName . '` ' . $columnSql);
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',indexName=' . $indexName . ',columnSql=' . $columnSql . ': does already exist.');
	}
}

// Add ALTER TABLE `foo` ADD FULLTEXT sql if not found
function addExtensionAddTableFulltextSql ($tableName, $indexName, $columnSql) {
	// Is the column there?
	if (!ifSqlTableIndexExist('{?_MYSQL_PREFIX?}_' . $tableName, $indexName)) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` ADD FULLTEXT `' . $indexName . '` ' . $columnSql);
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',indexName=' . $indexName . ',columnSql=' . $columnSql . ': does already exist.');
	}
}

// Add ALTER TABLE `foo` CHANGE sql if not found
function addExtensionChangeTableColumnSql ($tableName, $fromColumnName, $toColumnName, $columnSql) {
	// Is the column there?
	if ((ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_' . $tableName, $fromColumnName)) && (($fromColumnName == $toColumnName) || (!ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_' . $tableName, $toColumnName)))) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` CHANGE `' . $fromColumnName . '` `' . $toColumnName . '` ' . $columnSql);
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',fromColumnName=' . $fromColumnName . ',toColumnName=' . $toColumnName . ',columnSql=' . $columnSql . ': Cannot be changed.');
	}
}

// Add ALTER TABLE `foo` DROP sql if not found
function addExtensionDropTableColumnSql ($tableName, $columnName) {
	// Is the column there?
	if (ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_' . $tableName, $columnName)) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` DROP `' . $columnName . '`');
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',columnName=' . $columnName . ': does not exist.');
	}
}

// Add ALTER TABLE `foo` DROP INDEX sql if not found
function addExtensionDropTableIndexSql ($tableName, $indexName) {
	// Is the column there?
	if (ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_' . $tableName, $indexName)) {
		// Then add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` DROP INDEX `' . $indexName . '`');
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'tableName=' . $tableName . ',indexName=' . $indexName . ': does not exist.');
	}
}

// Add configuration entry if not found for actual extension
function addConfigAddSql ($columnName, $columnSql) {
	// Is the column there?
	if (!ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_config', $columnName)) {
		// Not found, so add it
		addExtensionAddTableColumnSql('config', $columnName, $columnSql);
	} elseif (isDebugModeEnabled()) {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'Configuration entry ' . $columnName . ' already created. columnSql=' . $columnSql);
	}
}

// Drop configuration entry if found for actual extension
function addConfigDropSql ($columnName) {
	// Is the column there?
	if (ifSqlTableColumnExists('{?_MYSQL_PREFIX?}_config', $columnName)) {
		// Found, so add it
		addExtensionDropTableColumnSql('config', $columnName);
	} elseif (isDebugModeEnabled()) {
		// Add debug line, reportBug() would cause some extenion updates fail
		logDebugMessage(__FUNCTION__, __LINE__, 'Configuration entry ' . $columnName . ' not found.');
	}
}

// Change configuration entry for actual extension
function addConfigChangeSql ($oldColumnName, $newColumnName, $columnSql) {
	// Add the SQL statement
	addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_config` CHANGE `' . $oldColumnName . '` `' . $newColumnName . '` ' . $columnSql);
}

/**
 * Checks if given subject is found and if not, adds an SQL query to the
 * extension registration queue.
 */
function registerExtensionPointsData ($subject, $columnName, $lockedMode, $paymentMethod) {
	// Default is old extension version
	$add = '';

	// Is the extension equal or newer 0.8.9?
	if (((isInstallationPhase()) && ((getExtensionMode() == 'register') || (getExtensionMode() == 'update'))) || (isExtensionInstalledAndNewer('sql_patches', '0.8.9'))) {
		// Then add provider
		$add = " AND `account_provider`='EXTENSION'";
	} // END - if

	// Is the 'subject' there?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ifSqlTableExists(points_data)=' . ifSqlTableExists('points_data') . ',getExtensionMode()=' . getExtensionMode() . ',add=' . $add);
	if (((!ifSqlTableExists('points_data')) && ((getExtensionMode() == 'register') || (getExtensionMode() == 'update'))) || (countSumTotalData($subject, 'points_data', 'id', 'subject', TRUE, $add) == 0)) {
		// Not found so:
		if ((isset($GLOBALS['previous_extension'][getCurrentExtensionName()])) && (!ifSqlTableExists('points_data'))) {
			$dummy = $GLOBALS['previous_extension'][getCurrentExtensionName()];
			reportBug(__FUNCTION__, __LINE__, 'previous_extension[' . gettype($dummy) . ']=' . $dummy . ',getCurrentExtensionName()=' . getCurrentExtensionName() . ' - Under development, please report this!');
		} // END - if

		// ... add an SQL query
		addExtensionSql(sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_points_data` (`subject`, `column_name`, `locked_mode`, `payment_method`) VALUES ('%s','%s','%s','%s')",
			$subject,
			$columnName,
			$lockedMode,
			$paymentMethod
		));
	} // END - if
}

/**
 * Checks if given subject is found and if so, adds an SQL query to the
 * extension unregistration queue.
 */
function unregisterExtensionPointsData ($subject) {
	// Default is old extension version
	$add = '';

	// Is the extension equal or newer 0.8.9?
	if (isExtensionInstalledAndNewer('sql_patches', '0.8.9')) {
		// Then add provider
		$add = " AND `account_provider`='EXTENSION'";
	} // END - if

	// Is the 'subject' there?
	if (countSumTotalData($subject, 'points_data', 'id', 'subject', TRUE, $add) == 1) {
		// Found one or more, so add an SQL query
		addExtensionSql(sprintf("DELETE LOW_PRIORITY FROM `{?_MYSQL_PREFIX?}_points_data` WHERE `subject`='%s'" . $add . " LIMIT 1",
			$subject
		));
	} // END - if
}

// Enables/disables productive mode for current extension (used only while
// registration).
// @TODO This should be rewrittten to allow, more development states, e.g. 'planing','alpha','beta','beta2','stable'
function enableExtensionProductive ($isProductive = TRUE) {
	// Log debug message
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ',isProductive=', intval($isProductive));

	// Set it
	$GLOBALS['ext_productive'][getCurrentExtensionName()] = (bool) $isProductive;
}

// Checks whether the extension is in productive phase. If not set, development
// phase (=false) is assumed.
function isExtensionProductive ($ext_name = '') {
	// Is the extension name empty? Then use current
	if (empty($ext_name)) {
		// Get current extension name
		$ext_name = getCurrentExtensionName();
	} // END - if
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ' - ENTERED!');

	// Is there cache?
	if (!isset($GLOBALS[__FUNCTION__][$ext_name])) {
		// Load extension only if not yet loaded
		if (!isset($GLOBALS['ext_productive'][$ext_name])) {
			// Load extension in test mode
			loadExtension($ext_name, 'test');
		} // END - if

		// Determine it
		$GLOBALS[__FUNCTION__][$ext_name] = ((isset($GLOBALS['ext_productive'][$ext_name])) && ($GLOBALS['ext_productive'][$ext_name] === TRUE));
	} // END - if

	// Return result
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',isProductive=', intval($GLOBALS[__FUNCTION__][$ext_name]) . ' - EXIT!');
	return $GLOBALS[__FUNCTION__][$ext_name];
}

// Mark extension file as loaded
function markExtensionAsLoaded ($ext_name) {
	// Is it already loaded?
	if (isExtensionLoaded($ext_name)) {
		// Then abort here
		reportBug(__FUNCTION__, __LINE__, 'Extension ' . $ext_name . ' is already marked as loaded!');
	} // END - if

	// Mark it
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_loaded=true');
	$GLOBALS['ext_loaded']['ext_name'][$ext_name] = TRUE;
}

// Determine whether the given extension is already loaded
function isExtensionLoaded ($ext_name) {
	// Is it there?
	return ((isset($GLOBALS['ext_loaded']['ext_name'][$ext_name])) && ($GLOBALS['ext_loaded']['ext_name'][$ext_name] === TRUE));
}

// Mark extension's library file as loaded
function markExtensionLibraryAsLoaded ($ext_name) {
	// Is it already loaded?
	if (isExtensionLibraryLoaded($ext_name)) {
		// Then abort here
		reportBug(__FUNCTION__, __LINE__, 'Extension library ' . $ext_name . ' is already marked as loaded!');
	} // END - if

	// Mark it
	$GLOBALS['ext_loaded']['library'][$ext_name] = TRUE;
}

// Determine whether the given extension's library is already loaded
function isExtensionLibraryLoaded ($ext_name) {
	// Is it there?
	return ((isset($GLOBALS['ext_loaded']['library'][$ext_name])) && ($GLOBALS['ext_loaded']['library'][$ext_name] === TRUE));
}

// [EOF]
?>