memcache 搜索十次

<span style="color:#990000;">   public function sou(){        $val=$_GET['sou'];        //连接mem        $mem=new Memcache;        $mem->connect("127.0.0.1",11211);        $pd=$mem->get("$val");        if($pd){            if($pd<=9){                $pd++;                $mem->replace("$val",$pd,0,600);                $data=array('name'=>$val);                $arr=$this->db->like($data)->get('book')->result_array();                echo json_encode($arr);            }else if($pd==10){                $data=array('name'=>$val);                $arr=$this->db->like($data)->get('book')->result_array();                $mem->replace("$val",$arr,0,600);                echo json_encode($arr);            }else{                echo json_encode($pd);            }        }else{            $mem->set("$val",1,0,6000);            $data=array('name'=>$val);            $arr=$this->db->like($data)->get('book')->result_array();            echo json_encode($arr);        }    }</span>