singleton in php
// General singleton class. class Singleton { // Hold the class instance. private static $instance = null; // The constructor is private // to prevent initiation with outer code. private function __construct() { // The expensive process (e.g.,db connection) goes here. } // The object is created from within the class itself // only if the class has no instance. public static function getInstance() { if (self::$instance == null) { self::$instance = new Singleton(); } return self::$instance; } }
