PDOでSingletonを実現しよう | @blog.justoneplanet.info■はじめはコンナ感じのコードを書いてみた class Db extends PDO { private static $instance; public function __construct($dsn, $DB_USER, $DB_PASS){ parent::__construct($dsn, $DB_USER, $DB_PASS); } public static function getDbh(){ if(!isset(self::$instance)){ $dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME . ''; self::$instance = new self($dsn, DB_USER, DB_PASS); } return self::$instance; } public final function __
