tp5/fastadmin 實現在文章內頁上一篇/下一篇的翻頁功能

1.獲取當前文章所在分類的所有文章id

$ids = Db::name('article')->where('category_id',$category_id)->column('id');

2.定位當前文章的位置，來獲取上一篇文章，下一篇文章的id

foreach ($ids as $k => $v) {
           if($id==$ids[$k]){
           	  //定位當篇
           	  //獲取下一篇
           	  if(isset($ids[$k+1])){
           	  	$next_id = $ids[$k+1];
           	  }else{
           	  	$next_id = '';
           	  }
           	  //獲取上一篇
           	  if(isset($ids[$k-1])){
           	  	$pre_id = $ids[$k-1];
           	  }else{
           	  	$pre_id = '';
           	  }
           }
 }

3.根據獲取到的上一篇/下一篇文章id來獲取文章標題

if($next_id != ''){
        	$next_artilce = Db::name('article')->where('id',$next_id)->field('id,category_id,name')->find();
        }else{
        	$next_artilce = '';
        }

        if($pre_id !=''){
        	$pre_article = Db::name('article')->where('id',$pre_id)->field('id,category_id,name')->find();
        }else{
        	$pre_article = '';
        }