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Instance unique d'un objet.

<?php 
class Singleton 
{ 
    private static $_instance ; 
 
    private function __construct() { }
 
    public static function GetInstance() 
    { 
        if (!isset(self::$_instance)) 
        { 
            self::$_instance = new Singleton() ; 
        } 
        return self::$_instance; 
    }
}
?>