防止地址栏的跳转

PHP页面：

<?php
namespace app\index\controller;

use think\Controller;
use think\Db;
use think\Request;
use think\Session;

class Commen extends Controller
{
    //初始化
    public function _initialize()
    {
        //判断session的值
        if(!Session::get("user",'think'))
        {
            $this->error("非法登录");
        }
        $this->power_cat();
    }
    //查看权限
    public function power_cat()
    {
        $request=Request::instance();
        $controller=$request->controller();//当前控制器
        $action=$request->action();//当前方法名
        $data=Session::get("data",'think');
        $falg=false;
        foreach ($data as $k=>$v)
        {
            if($v['action_name']==$action)
            {
                $falg=true;
            }
        }
        if(!$falg)
        {
            $this->error("对不起，您没有权限");
        }
    }
}