<?php
session_start();
class DB{
private static $car;
//私有靜態變數;
private $redis;//靜態變數
private function __construct(){
$this->redis = new Redis();
$this->redis->connect('127.0.0.1','6379');
}
private function __clone(){
     //防止克隆
    }
public static  function test(){
    //檢測有沒有例項化本身;
     if(!self
 
::$car instanceof self){
return $car=new self;
        }
return self::$car;
    }
public  function  tat($ar){
    }
}
$arr=DB::test()->tat(5);