vol.1 & Singleton

Wikipedia

Wikipedia

Wikipedia

ex.

ex.

/

ex.

GoF23

Singleton

class Singleton{ private static $instance;

private __construct() { }

public getInstance() { if (self::$instance) { return self::$instance; }

self::$instance = new self; return self::$instance; }}

DB

DB

DBMultiton

private static $instance = [];