How to implement php collection function

How to implement the php collection function: first create the database table; then create the front-end code to implement the login interface; then implement the collection style through html; finally use php for background processing.

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This is the database table

Not much to say, let’s talk about the code
Front desk

<script>
    $(function(){
      $(&#39;#sc&#39;).click(function(){

          var gid=$(this).attr(&#39;data-id&#39;);          var data={
            gid:gid
          };
          $.ajax({
            url:"{:U(&#39;Goods/collect_add&#39;)}", 
            type:"post",
            data:data,
            success:function(data){
              // window.clearInterval(timer);
                            if(data==1){
                                window.location.href="{:U(&#39;Public/login&#39;)}"; //登陆界面
                            }else {                                if(data==2){
                                    $(&#39;#sc&#39;).css({                                        &#39;background-color&#39;:&#39;white&#39;,                                        &#39;color&#39;:&#39;#00ccff&#39;,
                                    });
                                    $(&#39;#sc_words&#39;).html(                                        &#39;收藏&#39;
                                    );
                                }else if(data==3){
                                    $(&#39;#sc&#39;).css({                                        &#39;background-color&#39;:&#39;#00ccff&#39;,                                        &#39;color&#39;:&#39;white&#39;,
                                    });
                                    $(&#39;#sc_words&#39;).html(                                        &#39;已收藏&#39;
                                    );
                                }else{
                                    alert(data);
                                }
                            }
            },
            error:function(){
              alert(&#39;请求失败&#39;);
            }
          });
      });
    })</script>

html part

      <p id="sc" data-id="{$detail.id}" class="in_right">
        <p id="sc_words">收藏</p>
      </p>

PHP background processing

    // 商品收藏   1 代表未登录 2代表取消收藏  3 代表 收藏成功 
    public function collect_add(){
      if(empty(session('uid'))){        echo '1';
      }else {        $collect=M('collect');        $gid=I('post.gid');        //先确定是否已收藏
        $map['gid']=$gid;        $map['uid']=session('uid');        $data=$collect->where($map)->find();        if($data){          if($data['status']==1){            $collect->where('id='.$data['id'])->setField('status',0);            echo '2';
          }else{            $collect->where('id='.$data['id'])->setField('status',1);            echo '3';
          }
        }else{          if($collect->create()){            $collect->gid=$gid;            $collect->create_time=get_date();            $collect->uid=session('uid');            $collect->status=1;            $collect->add();            echo '3';
          }else{            echo '服务器出错，请重试!';
          }
        }
      }
    }

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