singleton

singleton

class Database
{
    /**
     * @var \PDO
     */
    protected static $conn;

    /**
     * @return \PDO
     */
    public static function getDB()
    {
        if (! self::$conn instanceof \PDO) {
            self::$conn = new \PDO();
        }

        return self::$conn;
    }
}


$conn = Database::getDB();

$conn->query("blo bla bla");