tp框架写了个方法获取顶级分类return结果就是null，在辅助函数都能打印出结果。

Question

本帖最后由 xuzuning 于 2012-09-11 06:32:30 编辑

Answer 1

    function getFirst($id_category){     
          $cate_info=$this->category_obj->where('id_category='.$id_category)->find();   
          echo $this->category_obj->getLastSql().'<br/>';  
          if($cate_info['pid']!=0){
               $this->getFirst($cate_info['pid']);//这里没有接住返回的数据               
          }else{
               dump($cate_info);
               return $cate_info;
          }          
     }

Answer 2

function getFirst($id_category){     
          $cate_info=$this->category_obj->where('id_category='.$id_category)->find();   
          echo $this->category_obj->getLastSql().'<br/>';  
          if($cate_info['pid']!=0){
               $cate_info .=$this->getFirst($cate_info['pid']);               
          }else{
               dump($cate_info);
               return $cate_info;
          }          
     }

Answer 3

function getFirst($id_category){   
  $cate_info=$this->category_obj->where('id_category='.$id_category)->find();   
       echo $this->category_obj->getLastSql().'<br/>';   
  if($cate_info['pid']!=0){
       $cate_info =$this->getFirst($cate_info['pid']);   
  }else{
       dump($cate_info);
       return $cate_info;
  }   
  }

Answer 4

function getFirst($id_category){   
  $cate_info=$this->category_obj->where('id_category='.$id_category)->find();   
       echo $this->category_obj->getLastSql().'<br/>';   
  if($cate_info['pid']!=0){
       $cate_info =$this->getFirst($cate_info['pid']);   
  }
      return $cate_info;
    }
另外我发现你2个查询语句是一样的吧。