php使用递归输出为null解决

 

/**

* 获取 面包屑 栏目

*/

function getNavBread($id,$nav_name='')

{

    $one=Db::name('user_rule')->where("id",$id)->find();

    if($one['pid']!=5){

          if(!$nav_name){

              $html = $one['name'];

        }else{

              $html = $one['name'].'>'.$nav_name;

        }

        return getNavBread($one['pid'],$html);

    }else{

          $html = $one['name'].'>'.$nav_name;

      //die('12');

        return $html;

    }

}

即使是回调函数本身也需要return出