php 单例模式

<body>
<?php

//单例模式
/*class Ren
{
    public $name;
}

$r = new Ren();
$r1 = new Ren();

*/

class DA
{
    public $name;
    static private $dx;//存放对象的变量
    
    //将构造变为私有，外界没法造对象
    private function __construct()
    {
    }
    
    //提供一个造对象的方法
    static function CreateDX()
    {
        if(empty(self::$dx))
        {
            self::$dx = new DA();
        }
        
        return self::$dx;
    }
}

$d = DA::CreateDX();
$d1 = DA::CreateDX();
$d1->name = "lisi";

var_dump($d==$d1);



?>
</body>
</html>
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