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 $family The category of the configuration value
39 public static function load($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 The category of the configuration value
76 * @param string $key The configuration key to query
77 * @param mixed $default_value optional, The value to return if key is not set (default: null)
78 * @param boolean $refresh optional, If true the config is loaded from the db and not from the cache (default: false)
80 * @return mixed Stored value or null if it does not exist
82 public static function get($family, $key, $default_value = null, $refresh = false)
87 // Do we have the cached value? Then return it
88 if (isset(self::$cache[$family][$key])) {
89 if (self::$cache[$family][$key] === '!<unset>!') {
90 return $default_value;
92 return self::$cache[$family][$key];
97 $ret = dba::select('config', array('v'), array('cat' => $family, 'k' => $key), array('limit' => 1));
98 if (DBM::is_result($ret)) {
100 $val = (preg_match("|^a:[0-9]+:{.*}$|s", $ret['v']) ? unserialize($ret['v']) : $ret['v']);
102 // Assign the value from the database to the cache
103 self::$cache[$family][$key] = $val;
104 self::$in_db[$family][$key] = true;
106 } elseif (isset($a->config[$family][$key])) {
107 // Assign the value (mostly) from the .htconfig.php to the cache
108 self::$cache[$family][$key] = $a->config[$family][$key];
109 self::$in_db[$family][$key] = false;
111 return $a->config[$family][$key];
114 self::$cache[$family][$key] = '!<unset>!';
115 self::$in_db[$family][$key] = false;
117 return $default_value;
121 * @brief Sets a configuration value for system config
123 * Stores a config value ($value) in the category ($family) under the key ($key)
124 * for the user_id $uid.
126 * Note: Please do not store booleans - convert to 0/1 integer values!
128 * @param string $family The category of the configuration value
129 * @param string $key The configuration key to set
130 * @param string $value The value to store
132 * @return mixed Stored $value or false if the database update failed
134 public static function set($family, $key, $value)
138 // We store our setting values in a string variable.
139 // So we have to do the conversion here so that the compare below works.
140 // The exception are array values.
141 $dbvalue = (!is_array($value) ? (string)$value : $value);
143 $stored = self::get($family, $key, null, true);
145 if (($stored === $dbvalue) && self::$in_db[$family][$key]) {
149 if ($family === 'config') {
150 $a->config[$key] = $dbvalue;
151 } elseif ($family != 'system') {
152 $a->config[$family][$key] = $dbvalue;
155 // Assign the just added value to the cache
156 self::$cache[$family][$key] = $dbvalue;
158 // manage array value
159 $dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
161 dba::update('config', array('v' => $dbvalue), array('cat' => $family, 'k' => $key), true);
164 self::$in_db[$family][$key] = true;
171 * @brief Deletes the given key from the system configuration.
173 * Removes the configured value from the stored cache in $a->config
174 * and removes it from the database.
176 * @param string $family The category of the configuration value
177 * @param string $key The configuration key to delete
181 public static function delete($family, $key)
183 if (isset(self::$cache[$family][$key])) {
184 unset(self::$cache[$family][$key]);
185 unset(self::$in_db[$family][$key]);
188 $ret = dba::delete('config', array('cat' => $family, 'k' => $key));