递归

//获取所有的粉丝

private function _getChildren($data,$parent_id,$isClear=false,$level=0)
{
    static  $ret = array();
    if($isClear)
        $ret = array();
    foreach ($data as $k=>$v){
        if($v['parent_id1']==$parent_id){
            $v['level'] = $level;
            $ret[] = $v;
            $this->_getChildren($data,$v['source'],false,$level+1);
        }
    }
    return $ret;
}

// 获取所有的爹

public function _getDad($data,$uid,$isClear=false,$level=0)
{
    static  $res = array();
    if($isClear){
        $res = array();
    }
    foreach ($data as $k=>$v){
        if($v['uid']==$uid){
            $v['level'] = $level;
            $res[] = $v['parent_uid'];
            $this->_getDad($data,$v['parent_uid'],false,$level+1);
        }
    }
    return $res;
}