thinkphp上一篇，下一篇

1. //上一篇 
2.   $front=$Article->where("id<".$id)->order(&＃39;id desc&＃39;)->limit(&＃39;1&＃39;)->find(); 
3.   $this->assign(&＃39;front&＃39;,$front); 
4.   //下一篇 
5.   $after=$Article->where("id>".$id)->order(&＃39;id desc&＃39;)->limit(&＃39;1&＃39;)->find(); 
6.   $this->assign(&＃39;after&＃39;,$after); 
7.  //上一篇 
8. $front=$Classroom->where("nid<".$nid)->order(&＃39;nid desc&＃39;)->limit(&＃39;1&＃39;)->find(); 
9. $f=!$front?&＃39;没有了&＃39;:&＃39;.__URL__.&＃39;/nid/&＃39;.$front[&＃39;nid&＃39;].&＃39;">&＃39;.$front[&＃39;title&＃39;].&＃39;&＃39;; 
10. $this->assign(&＃39;front&＃39;,$f); 
11. //下一篇 
12. $after=$Classroom->where("nid>".$nid)->order(&＃39;nid desc&＃39;)->limit(&＃39;1&＃39;)->find(); 
13. $a=!$after?&＃39;没有了&＃39;:&＃39;.__URL__.&＃39;/nid/&＃39;.$after[&＃39;nid&＃39;].&＃39;">&＃39;.$after[&＃39;title&＃39;].&＃39;&＃39;; 
14. $this->assign(&＃39;after&＃39;,$a);