PHP 递归读取无限级分类

 /**
      * 【获取第一级分类】
      *  20170829
      *
      * @return array
      */
     public function getCateList(){
         $this->catelog = [];
         //获取第一级分类
         $rst = $this->find()->where(['is_root'=>0, 'status' => 10])->asArray()->all();

         if($rst){
             foreach ($rst as $row){
                 $this->catelog[] = [
                     'id' => $row['id_cate'],
                     'catename' => $row['catename'],
                     'catename_en' => $row['catename_en'],
                     'cover' => $row['cover'],
                     'depath' => 0,
                     'is_root' => $row['is_root'],
                 ];
                 //获取子分类
                 $this->getChild($row['id_cate'], 1);

             }
         }

         return $this->catelog;
     }

     /**
      * 【递归获取所有子分类】
      *  20170829
      *
      * @param $id
      * @param $depth
      */
     function getChild($id,$depth ){
         //global $catalog;

         $rst = $this->find()->where(['is_root' => $id, 'status' => 10])->asArray()->all();
         if (count($rst) > 0) {
             foreach ($rst as $row){
                 $this->catelog[] = [
                     'id' => $row['id_cate'],
                     'catename' => $row['catename'],
                     'catename_en' => $row['catename_en'],
                     'cover' => $row['cover'],
                     'depath' => $depth,
                     'is_root' => $row['is_root'],
                 ];
                 $this->getChild($row['id_cate'], 2);
             }
         }

     }