public static function instance() { if (!isset(self::$instance)) { self::$instance = new Db_Mysql(); } return self::$instance; }
public static function init($host, $user, $password, $database, $persistent = false) { self::$instance = new Db_Mysql(); self::$instance->host = $host; self::$instance->user = $user; self::$instance->password = $password; self::$instance->database = $database; self::$instance->persistent = $persistent; }