PHP单例

PHP单例

<?php
/*
实现过程:
首先防止住外部随便的new操作
*/
 
class Single {
    protected static $ins = null;
    protected $hash;
     
    private function __construct() {
        $this->hash = rand(100000,999999);
    }
 
    public static function getInstance() {
         if(self::$ins ==  null) {
            self::$ins = new self();
         }
 
         return self::$ins;
    }
 
    private function __clone() {
    }
}
 
 
$s1 = Single::getInstance();
$s2 = Single::getInstance();
?>