!" if it does not exist */ public function get($uid, $cat, $key); /** * Stores a config value ($value) in the category ($family) under the key ($key) * for the user_id $uid. * * @note Please do not store booleans - convert to 0/1 integer values! * * @param string $uid The user_id * @param string $cat The category of the configuration value * @param string $key The configuration key to set * @param string $value The value to store * * @return bool Operation success */ public function set($uid, $cat, $key, $value); /** * Removes the configured value from the stored cache * and removes it from the database. * * @param string $uid The user_id * @param string $cat The category of the configuration value * @param string $key The configuration key to delete * * @return bool */ public function delete($uid, $cat, $key); /** * Checks, if the current adapter is connected to the backend * * @return bool */ public function isConnected(); }