TP3.2 realizes switching between previous and next chapters

To implement the previous article and the next article, a primary key value needs to be passed. Let’s take news as an example. The first is the news list. When I click on the list, I will enter the content page, so when I click on the news list:

Front-end page:

<span>{$v.a_content}</span><a href="{$v.a_writer}?id={$v.a_id}">阅读详细</a></p></p></section>

In this way, you can get the primary key; then enter the content page

The content page has the previous article and Next article;

Controller:

<? 
 //新闻内
    public function index04(){        
        $this->ff();        
        $idds = I(&#39;get.id&#39;);             
            //上一篇
        $shang = M(&#39;article&#39;)->where("a_id <$idds and a_keyword=489")->order(&#39;a_id desc&#39;)->limit(&#39;1&#39;)->find();//查数据
            if($shang){//              判断如果执行成功往前面扔
        $this->assign(&#39;shang&#39;,$shang);

       }       
       else{//         否则让他的标题等于暂无吧
            $shang[&#39;a_title&#39;] = "暂无";            
            $this->assign(&#39;shang&#39;,$shang);
        }        
//      下一篇
//同上
             $xia = M(&#39;article&#39;)->where("a_id >$idds and a_keyword=489")->order(&#39;a_id asc&#39;)->limit(&#39;1&#39;)->find();         
         if($xia){        
             $this->assign(&#39;xia&#39;,$xia);

       }       
       else{            
           $xia[&#39;a_title&#39;] = "暂无";            
           $this->assign(&#39;xia&#39;,$xia);
        }        
        
           $this->display(&#39;jiu:public/7-6newsview&#39;);
     }

Front end:

##

  <span class="prev">上一篇：<A href="{$shang.a_writer}?id={$shang.a_id}">{$shang.a_title}</A></span>
           <span class="next">下一篇：<A href="{$xia.a_writer}?id={$xia.a_id}">{$xia.a_title}</A></span>

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