关于给构造函数传达参数方法

<?php 
//给构造函数传达参数
header("Content-type: text/html; charset=utf-8");
class test
{
    private $user_ids=array("66645","66586");
    private $user_id;
    //构造传递参数
    public function __construct($user_id)
    {
        $this->user_id=$user_id;
        if(!in_array($this->user_id, $this->user_ids))
        {
            $res['status']=0;
            $res['msg']="你的账号不在测试账号内";
            // ajax_return($res);exit;
            print_r($res);exit;
        }
    }
    public function test1($user_id)
    {
        echo "<br/>";
        echo "___1111";    
    }

}

$user_id=66642; 
//new类的时候带参数
$obj=new test($user_id);
$obj->test1($user_id);



 ?>