php判断用户有没有访问权限

    //用来检查用户的访问权限
    
    public function check_qx($name){
        //$name代表要查询的字段名字  
        $this->load->model(‘User_model‘);
        $this->load->model(‘Admin_model‘);
        $uid = $this->Admin_model->userdata(‘id‘); 
        $useridinfo=$this->db->query("SELECT `userid` FROM `admin_user` WHERE `id` = $uid")->result_array();
       
        //这是得到的userid：
        $userid=$useridinfo[0][‘userid‘];
         
        // $qxuserinfo=  $this->db->query("SELECT * FROM `qx` WHERE `userid` LIKE ‘$uid‘")->result_array();
        
        $result = $this->db->query("SELECT * FROM `qx` WHERE `userid` LIKE ‘$userid‘")->result_array(); 
        //这是根据对应字段得到的返回值 
           
        $url= $_SERVER[‘HTTP_REFERER‘];
        //var_dump($url);
        //var_dump($url);
        
        /*if($result[0][$name]==0){
             //等于0 说明没有权力访问
             //TODO 记录用户最后访问的地址，自动返回上一级目录 
              //$referer = $_SERVER[‘HTTP_REFERER‘];
              //redirect($referer);
             //echo "<script>alert(‘没有访问权限，请联系你的管理员‘);document.location.href=‘$referer‘</script>";
        }else{
            //
        };*/
        
        /*
        if($userdata[‘systemnyc‘]==0){
            $referer = $_SERVER[‘HTTP_REFERER‘];
            redirect($referer);
        } */
        
      
    }