<?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 - 2011 by Mailer Developer Team                   *
 * For more information visit: http://www.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', $dry_run = false) {
	// 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
		debug_report_bug(__FUNCTION__, __LINE__, '() 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;

	// 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');

		// 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')) {
			// Abort here, this must now always be set!
			debug_report_bug(__FUNCTION__, __LINE__, 'Extension version is empty, setting to 0.0. ext_name=' . $ext_name . ', ext_mode=' . $ext_mode . ', dry_run=' . intval($dry_run));
		} // END - if
	}

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

	// 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 ' . $ext_name . ', mode=' . getExtensionMode() . ', ver=' . getCurrentExtensionVersion());
	if ((isExtensionLoaded($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.", $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

	// Do we have 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');

	// Extension update notes
	// @TODO Do we still need this? setExtensionUpdateNotes('');

	// Include the extension file
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'Extension loaded.');
	loadExtensionInclude();

	// Is this extension deprecated?
	if (isExtensionDeprecated()) {
		// Deactivate the extension
		doDeactivateExtension($ext_name);

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

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

	// All fine!
	return true;
}

// Registeres an extension and possible update depencies
function registerExtension ($ext_name, $taskId, $dry_run = false, $logout = true) {
	// Set current extension name
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',task_id=' . $taskId . ',dry_run=' . intval($dry_run) . ',logout=' . intval($logout) . ' - ENTERED!');
	setCurrentExtensionName($ext_name);

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

	// 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()) || (isExtensionInstalled($ext_name))) {
		// Abort here with 'false'
		return false;
	} // END - if

	// When this extension is already in registration/update phase, all is fine
	if ((isExtensionRegistrationRunning($ext_name)) || (isExtensionUpdateRunning($ext_name))) {
		// Then abort here with 'true' becaus it is fine
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ' - ALREADY!');
		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 ($taskId == '0') {
		// Try to find the task
		$taskId = determineExtensionTaskId(getCurrentExtensionName());

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

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

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

	// Init variables
	$ret = false;
	$test = false;
	initIncludePool('extension');

	// By default we have no failures
	setExtensionReportsFailure(false);

	// Does this extension exists?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
	if (loadExtension(getCurrentExtensionName(), 'register', '0.0', isExtensionDryRun())) {
		// 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());

			// 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($ext_update, 'test', '', isExtensionDryRun()))) {
				// Set current extension name again
				setCurrentExtensionName($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
				if (empty($ext_ver)) {
					// Extension not registered so far so first load task's id...
					$task = determineExtensionTaskId($ext_update);

					// Entry found?
					if ($task > 0) {
						// Try to register the extension
						//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ':ext_update=' . $ext_update . ',taskId=' . $task);
						$test = registerExtension($ext_update, $task, isExtensionDryRun(), false);

						// Reset extension name
						setCurrentExtensionName($ext_name);
						//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',test=' . intval($test));
					} // 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!
					$test = true;
				} else {
					// Nothing to register / update before...
					$test = true;
				}
			} else {
				// Required file for update does not exists!
				$test = 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!
			$test = true;
		} // END - if

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

		// Remains true if extension registration reports no failures
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',test=' . intval($test));
		$test = (($test === true) && (getExtensionReportsFailure() === false));
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',test=' . intval($test));

		// Does everthing before wents ok?
		if ($test === 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() != '')) {
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName());
		// Remove task from system when id and extension's name is valid
		SQL_QUERY_ESC("DELETE LOW_PRIORITY FROM `{?_MYSQL_PREFIX?}_task_system` WHERE `id`=%s AND `status`='NEW' LIMIT 1",
			array(bigintval($taskId)), __FUNCTION__, __LINE__);
	}

	// Is this the sql_patches?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName() . '/' . getExtensionMode());
	if ((getCurrentExtensionName() == 'sql_patches') && ((getExtensionMode() == 'register') || (getExtensionMode() == 'remove')) && (!isExtensionDryRun()) && ($test)) {
		//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currentExtension=' . getCurrentExtensionName() . ': LOAD!');
		if ($logout === true) {
			// Then redirect to logout
			redirectToUrl('modules.php?module=admin&amp;logout=1&amp;' . getExtensionMode() . '=sql_patches');
		} else {
			// Add temporary filter
			registerFilter('shutdown', 'REDIRECT_TO_LOGOUT_SQL_PATCHES', true, true);
			$GLOBALS['ext_load_mode'] = getExtensionMode();
		}
	} // END - if

	// Return status code
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'currName=' . getCurrentExtensionName() . ',ext_name=' . $ext_name . ',test=' . intval($test) . ' - 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!
	if (!isAdmin()) return false;

	// 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', false);

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

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

	// Do we have 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 wether the given extension is installed
function isExtensionInstalled ($ext_name) {
	// We don't like empty extension names here
	if (empty($ext_name)) {
		// Please fix them all
		debug_report_bug(__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
		$isInstalled = $GLOBALS['ext_is_installed'][$ext_name];
	} elseif (isset($GLOBALS['cache_array']['extension']['ext_id'][$ext_name])) {
		// Found!
		$isInstalled = true;

		// Count cache hits
		incrementStatsEntry('cache_hits');
	} elseif ((isInstallationPhase())) {
		// Extensions are all inactive/not installed during installation
	} else {
		// Look in database
		$ext_id = getExtensionId($ext_name);

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

		// Do we have a record?
		$isInstalled = ($ext_id > 0);

		// 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
	return $isInstalled;
}

// Check if given extension is active
function isExtensionActive ($ext_name) {
	if (isInstallationPhase()) {
		// Extensions are all inactive during installation
		return false;
	} elseif (empty($ext_name)) {
		// Empty extension names must befixed
		debug_report_bug(__FUNCTION__, __LINE__, 'Empty extension name provided.');
	} elseif (!isExtensionInstalled($ext_name)) {
		// Not installed extensions are always inactive
		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?
		debug_report_bug(__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
	$data['ext_version'] = 'false';

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

	// Extensions are all inactive during installation
	if (isInstallationPhase()) return '';
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name);

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

		// Is the extension there?
		if (SQL_NUMROWS($result) == 1) {
			// Load entry
			$data = SQL_FETCHARRAY($result);
		} elseif (isDebugModeEnabled()) {
			// Not found, please report all
			debug_report_bug(__FUNCTION__, __LINE__, sprintf(": Cannot find extension %s in database!", $ext_name));
		}

		// Free result
		SQL_FREERESULT($result);

		// Set cache
		$GLOBALS['cache_array']['extension']['ext_version'][$ext_name] = $data['ext_version'];
	}

	// Extension version should not be invalid
	if (($data['ext_version'] == 'false') && ($force === false)) {
		// Please report this trouble
		debug_report_bug(__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, $dry_run = false) {
	// Only admins are allowed to update extensions
	if ((!isAdmin()) || (empty($ext_name))) {
		return false;
	} // END - if

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

	// 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: */ debugOutput(getCurrentExtensionName() . '/' . $ext_name . ':' . getThisExtensionVersion() . '/' . $ext_ver . '/' . intval(is_array($history)));
	if (((getThisExtensionVersion() != $ext_ver) || (isExtensionDryRun())) && (is_array($history))) {
		// Search for starting point
		$start = array_search($ext_ver, $history);

		// 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!
							$test = updateExtension($ext_depend, getExtensionVersion($ext_depend), isExtensionDryRun());
						} else {
							// Register new extension
							$test = registerExtension($ext_depend, 0, isExtensionDryRun(), false);
						}
					} // END - if
				} // END - foreach

				// Set extension version here
				setCurrentExtensionVersion($ext_ver);

				// Set name back
				setCurrentExtensionName($ext_name);
			} // 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
}

// Output verbose SQL table for extension
function addExtensionVerboseSqlTable ($title = '', $dashed = '', $switch = false, $width = '100%') {
	// Empty title?
	if (empty($title)) {
		// Then fix it to default
		$title = '{--ADMIN_SQLS_EXECUTED_ON_REMOVAL--}';
	} // END - if

	// Init variables
	$OUT = '';

	// Do we have queries?
	if (isVerboseSqlEnabled()) {
		// Do we have 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('{', '&#123;', str_replace('}', '&#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(
				'width'  => $width,
				'dashed' => $dashed,
				'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_NO_ADDITIONAL_SQLS--}', 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!
		debug_report_bug(__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';

	// Do we have 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 wether the given extension name is valid
function isExtensionNameValid ($ext_name) {
	// Do we have cache?
	if (!isset($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 wether 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
		debug_report_bug(__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 ($ext_name) {
	// Is the extension installed?
	if (!isExtensionInstalled($ext_name)) {
		// Non-installed extensions cannot be activated
		debug_report_bug(__FUNCTION__, __LINE__, 'Tried to deactivate non-installed extension ' . $ext_name);
	} // 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);

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

// Checks wether the extension is older than given
function isExtensionOlder ($ext_name, $ext_ver) {
	// Get current extension version
	$currVersion = getExtensionVersion($ext_name);

	// Remove all dots from both versions
	$currVersion = str_replace('.', '', $currVersion);
	$ext_ver = str_replace('.', '', $ext_ver);

	// Now compare both and return the result
	return ($currVersion < $ext_ver);
}

// 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! :-(
		debug_report_bug(__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?
	if (($taskId == '0') && (!isExtensionInstalled($ext_name))) {
		// Set default message if ext-foo is missing
		$message = getMaskedMessage('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?
	if (($taskId == '0') && (isExtensionInstalled($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) {
	// Default is not found
	$data['task_id'] = '0';

	// 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)) {
			// Update notes found
			$content = array(
				'ver'   => $ext_ver,
				'notes' => getExtensionUpdateNotes($ext_ver)
			);

			// Reset them
			setExtensionUpdateNotes('', $ext_ver);
		} elseif (in_array($ext_ver, array('0.0', '0.0.0'))) {
			// Initial release
			$content = array(
				'ver'   => $ext_ver,
				'notes' => '{--INITIAL_RELEASE--}'
			);
		} else {
			// No update notes found
			$content = array(
				'ver'   => $ext_ver,
				'notes' => '{--NO_UPDATE_NOTES--}'
			);
		}

		// 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
	$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 wether 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 () {
	return ($GLOBALS['ext_deprecated'][getCurrentExtensionName()] == 'Y');
}

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

	// Is it not yet added?
	/* Only for debugging!
	if ((isset($updateDepends, $GLOBALS['ext_running_updates'][getCurrentExtensionName()])) && (in_array($updateDepends, getExtensionUpdatesRunning()))) {
		// Double-adding isn't fine, too
		debug_report_bug(__FUNCTION__, __LINE__, '() called twice: updateDepends=' . $updateDepends . ',currentExtension=' . getCurrentExtensionName());
	} // END - if
	*/

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

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

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

// Checks wether 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...
		debug_report_bug(__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
		debug_report_bug(__FUNCTION__, __LINE__, '() already called! ext_name=' . $ext_name);
	} // END - if

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

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

// Checks wether an update is already running for given extension
function isExtensionUpdateRunning ($ext_name) {
	// Current and given extensions means whole array
	if ($ext_name == getCurrentExtensionName()) {
		// Default is not found
		$isRunning = false;

		// Walk through whole array
		foreach ($GLOBALS['ext_running_updates'] as $ext1=>$depends) {
			// Is it found?
			if (($ext1 == $ext_name) || ($isRunning === true)) {
				// found
				logDebugMessage(__FUNCTION__, __LINE__, 'ext1=' . $ext1 . ',ext_name=' . $ext_name . ',isRunning=' . intval($isRunning));
				$isRunning = true;
				break;
			} // END - if
		} // END - foreach

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

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

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

	// 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()])) initExtensionUpdateIterator();

	// 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 setExtensionReportsFailure ($reportsFailure) {
	$GLOBALS['ext_reports_failure'] = (bool) $reportsFailure;
}

// Getter for EXT_REPORTS_FAILURE flag
function getExtensionReportsFailure () {
	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 () {
	return $GLOBALS['ext_ver_history'][getCurrentExtensionName()];
}

// Setter for EXT_UPDATE_NOTES
function setExtensionUpdateNotes ($updateNotes, $ext_ver = '') {
	// . '/' . getCurrentExtensionVersion()
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()=' . getCurrentExtensionName() . ',getExtensionMode()=' . getExtensionMode() . ',ext_ver=' . $ext_ver . ',updateNotes()=' . strlen($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_NOTES
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
		debug_report_bug(__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 ($notes) {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()=' . getCurrentExtensionName() . ', notes()=' . strlen($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!
		debug_report_bug(__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) {
	// Add it
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . getCurrentExtensionName() . ',ext_version=' . getCurrentExtensionVersion() . ',sql=' . $sql);
	$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
		debug_report_bug(__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
		debug_report_bug(__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 wether 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
	$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 () {
	// Do we have some entries?
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ENTRY!');
	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
	//* 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 ($dry_run = true) {
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'getCurrentExtensionName()='.getCurrentExtensionName().',dry='.intval($dry_run));
	$GLOBALS['ext_dry_run'] = (bool) $dry_run;
}

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

// 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
		debug_report_bug(__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
}

// "Getter" for 'extension has a CSS file' (with same name, of course)
function getExtensionHasCss () {
	// Default is no CSS
	$hasCss = 'N';

	// Construct FQFN for check
	$FQFN = sprintf("%stheme/%s/css/%s.css",
		getPath(),
		getCurrentTheme(),
		getCurrentExtensionName()
	);

	// Is it there?
	if (isFileReadable($FQFN)) {
		// Readable, so it is there...
		$hasCss = 'Y';
	} // END - if

	// Return it
	return $hasCss;
}

// Checks wether the given extension has a language file
function ifExtensionHasLanguageFile ($ext_name) {
	// Do we have cache?
	if (isset($GLOBALS['cache_array']['extension']['ext_lang'][$ext_name])) {
		// Count cache hits
		incrementStatsEntry('cache_hits');
	} else {
		// Not readable is default
		$readable = 'N';

		// Is the language file readable for this extension?
		if (isLanguageIncludeReadable($ext_name)) {
			// Readable
			$readable = 'Y';
		} // END - if

		// Put it in cache
		$GLOBALS['cache_array']['extension']['ext_lang'][$ext_name] = $readable;
	}

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

// Load an extension's include file
function loadExtensionInclude () {
	// Is it readable?
	if (!isExtensionIncludeReadable()) {
		// Not readable
		debug_report_bug(__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 wether an extension is readable
function isExtensionIncludeReadable ($ext_name = '') {
	// If empty, use current
	if (empty($ext_name)) $ext_name = getCurrentExtensionName();

	// 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?
		if ((isFileReadable($funcsInclude)) && (!isExtensionLibraryLoaded($ext_name)) && (getExtensionMode() == 'test')) {
			// Cache it!
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_func=Y - FOUND!');
			$GLOBALS['cache_array']['extension']['ext_func'][$ext_name] = 'Y';
		} else {
			// Cache it!
			//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, 'ext_name=' . $ext_name . ',ext_func=N - NOT FOUND!');
			$GLOBALS['cache_array']['extension']['ext_func'][$ext_name] = 'N';
		}
	}

	// 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, $sql) {
	// Is the table not there?
	if (!isSqlTableCreated($tableName)) {
		// Is not found, so add it
		addExtensionSql('CREATE TABLE `{?_MYSQL_PREFIX?}_' . $tableName . '` ' . $sql);
	} else {
		// Is already there, which should not happen
		debug_report_bug(__FUNCTION__, __LINE__, 'The table ' . $tableName . ' is already created which should not happen.');
	}
}

// Adds a DROP TABLE statement if the requested tabled is there
function addDropTableSql ($tableName) {
	// Is the table there?
	if (isSqlTableCreated($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
		$GLOBALS['isSqlTableCreated'][$tableName] = false;
	} // 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, $visible, $locked, $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','%s','%s',%s)",
				$action,
				$title,
				$visible,
				$locked,
				bigintval($sort)
			);
		} else {
			// Add sub menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_guest_menu` (`action`,`what`,`title`,`visible`,`locked`,`sort`) VALUES('%s','%s','%s','%s','%s',%s)",
				$action,
				$what,
				$title,
				$visible,
				$locked,
				bigintval($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,locked=%s,visible=%s detected.", $action, $what, $title, $locked, $visible));
	}
}

// Adds a member menu to the SQL queue if the menu entry is not found
function addMemberMenuSql ($action, $what, $title, $visible, $locked, $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','%s','%s',%s)",
				$action,
				$title,
				$visible,
				$locked,
				bigintval($sort)
			);
		} else {
			// Add sub menu
			$sql = sprintf("INSERT INTO `{?_MYSQL_PREFIX?}_member_menu` (`action`,`what`,`title`,`visible`,`locked`,`sort`) VALUES('%s','%s','%s','%s','%s',%s)",
				$action,
				$what,
				$title,
				$visible,
				$locked,
				bigintval($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,visivle=%s,locked=%s detected.", $action, $what, $title, $visible, $locked));
	}
}

// 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 configuration entry if not found for actual extension
function addConfigAddSql ($columnName, $columnSql) {
	// Is the column there?
	if (!isSqlTableColumnFound('{?_MYSQL_PREFIX?}_config', $columnName)) {
		// Not found, so add it
		addExtensionSql('ALTER TABLE `{?_MYSQL_PREFIX?}_config` ADD `' . $columnName . '` ' . $columnSql);
	} else {
		// Add debug line
		logDebugMessage(__FUNCTION__, __LINE__, 'Configuration entry ' . $columnName . ' already created. columnSql=' . $columnSql);
	}
}

// Enables/disables productive mode for current extension (used only while
// registration).
function enableExtensionProductive ($isProductive = true) {
	// Log debug message
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, sprintf("ext_name=%s,isProductive=%d", getCurrentExtensionName(), intval($isProductive)));

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

// Checks wether 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

	// Do we have 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

	// Log debug message
	//* DEBUG: */ logDebugMessage(__FUNCTION__, __LINE__, sprintf("ext_name=%s,isProductive=%s", $ext_name, intval($GLOBALS[__FUNCTION__][$ext_name])));

	// Return result
	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
		debug_report_bug(__FUNCTION__, __LINE__, 'Extension ' . $ext_name . ' is already marked as loaded!');
	} // END - if

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

// Determine wether 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
		debug_report_bug(__FUNCTION__, __LINE__, 'Extension library ' . $ext_name . ' is already marked as loaded!');
	} // END - if

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

// Determine wether 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]
?>