3 * System Configuration Class
5 * @file include/Core/Config.php
7 * @brief Contains the class with methods for system configuration
9 namespace Friendica\Core;
11 use Friendica\Database\DBM;
15 * @brief Arbitrary sytem configuration storage
17 * Please do not store booleans - convert to 0/1 integer values
18 * The Config::get() functions return boolean false for keys that are unset,
19 * and this could lead to subtle bugs.
21 * There are a few places in the code (such as the admin panel) where boolean
22 * configurations need to be fixed as of 10/08/2011.
26 private static $cache;
27 private static $in_db;
30 * @brief Loads all configuration values of family into a cached storage.
32 * All configuration values of the system are stored in global cache
33 * which is available under the global variable $a->config
35 * @param string $family
36 * The category of the configuration value
39 public static function load($family = "config") {
41 // We don't preload "system" anymore.
42 // This reduces the number of database reads a lot.
43 if ($family === 'system') {
49 $r = dba::select('config', array('v', 'k'), array('cat' => $family));
50 while ($rr = dba::fetch($r)) {
52 if ($family === 'config') {
53 $a->config[$k] = $rr['v'];
55 $a->config[$family][$k] = $rr['v'];
56 self::$cache[$family][$k] = $rr['v'];
57 self::$in_db[$family][$k] = true;
64 * @brief Get a particular user's config variable given the category name
65 * ($family) and a key.
67 * Get a particular config value from the given category ($family)
68 * and the $key from a cached storage in $a->config[$uid].
69 * $instore is only used by the set_config function
70 * to determine if the key already exists in the DB
71 * If a key is found in the DB but doesn't exist in
72 * local config cache, pull it into the cache so we don't have
73 * to hit the DB again for this item.
75 * @param string $family
76 * The category of the configuration value
78 * The configuration key to query
79 * @param mixed $default_value optional
80 * The value to return if key is not set (default: null)
81 * @param boolean $refresh optional
82 * If true the config is loaded from the db and not from the cache (default: false)
83 * @return mixed Stored value or null if it does not exist
85 public static function get($family, $key, $default_value = null, $refresh = false) {
90 // Do we have the cached value? Then return it
91 if (isset(self::$cache[$family][$key])) {
92 if (self::$cache[$family][$key] === '!<unset>!') {
93 return $default_value;
95 return self::$cache[$family][$key];
100 $ret = dba::select('config', array('v'), array('cat' => $family, 'k' => $key), array('limit' => 1));
101 if (DBM::is_result($ret)) {
102 // manage array value
103 $val = (preg_match("|^a:[0-9]+:{.*}$|s", $ret['v']) ? unserialize($ret['v']) : $ret['v']);
105 // Assign the value from the database to the cache
106 self::$cache[$family][$key] = $val;
107 self::$in_db[$family][$key] = true;
109 } elseif (isset($a->config[$family][$key])) {
110 // Assign the value (mostly) from the .htconfig.php to the cache
111 self::$cache[$family][$key] = $a->config[$family][$key];
112 self::$in_db[$family][$key] = false;
114 return $a->config[$family][$key];
117 self::$cache[$family][$key] = '!<unset>!';
118 self::$in_db[$family][$key] = false;
120 return $default_value;
124 * @brief Sets a configuration value for system config
126 * Stores a config value ($value) in the category ($family) under the key ($key)
127 * for the user_id $uid.
129 * Note: Please do not store booleans - convert to 0/1 integer values!
131 * @param string $family
132 * The category of the configuration value
134 * The configuration key to set
135 * @param string $value
137 * @return mixed Stored $value or false if the database update failed
139 public static function set($family, $key, $value) {
142 // We store our setting values in a string variable.
143 // So we have to do the conversion here so that the compare below works.
144 // The exception are array values.
145 $dbvalue = (!is_array($value) ? (string)$value : $value);
147 $stored = self::get($family, $key, null, true);
149 if (($stored === $dbvalue) && self::$in_db[$family][$key]) {
153 if ($family === 'config') {
154 $a->config[$key] = $dbvalue;
155 } elseif ($family != 'system') {
156 $a->config[$family][$key] = $dbvalue;
159 // Assign the just added value to the cache
160 self::$cache[$family][$key] = $dbvalue;
162 // manage array value
163 $dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
165 dba::update('config', array('v' => $dbvalue), array('cat' => $family, 'k' => $key), true);
168 self::$in_db[$family][$key] = true;
175 * @brief Deletes the given key from the system configuration.
177 * Removes the configured value from the stored cache in $a->config
178 * and removes it from the database.
180 * @param string $family
181 * The category of the configuration value
183 * The configuration key to delete
186 public static function delete($family, $key) {
188 if (isset(self::$cache[$family][$key])) {
189 unset(self::$cache[$family][$key]);
190 unset(self::$in_db[$family][$key]);
193 $ret = dba::delete('config', array('cat' => $family, 'k' => $key));