递归查找祖先和子孙

    /-**

     * 查找祖先(给个id,找出他上面的父亲)

     * 

     *-/

    public function findParent($id,$ancestor){

        

        static $parent=array();

        

        foreach($ancestor as $v){

            //从小到大 排列

            if($v["id"]==$id){

                $parent[]=$v;

                

                if($v["parent_id"] > 0){

                    $this->findParent($v["parent_id"],$ancestor);

                }

            }

        }

        

        return $parent;

    }

   //查找所有的用户信息

$members  = M('member')->select();

print_r($this->findParent($id,$members));//$id是查找的起点；

    

    /-**

     * 查找子孙(给个父id,找出他下面的子孙)

     * 

     *-/

    

 public function findChild($pid=0,$lev=1,$descendant){

        static $child=array();

        

        foreach($this->area as $v){

            if($v["parent_id"]==$pid){

                

                $v["lev"]=$lev;

                $child[]=$v;

                $this->findChild2($v["id"],$lev+1,$descendant);

            }

        }

        

        return $child;

    }

     

}

   

$members  = M('member')->select();

print_r($this->ffindChild($id,null,$members));//$id是查找的起点；