php获取分类下面的所有子类方法

    static function getMenuTree($arrCat, $parent_id = 0, $level = 0,$all=True)    {        static  $arrTree; //使用static代替global        if(!$all) $arrTree ='';        if( empty($arrCat)) return FALSE;        $level++;        if($level == 1) $arrTree[] = $parent_id;        foreach($arrCat as $key => $value)        {            if($value['parent_cid' ] == $parent_id)            {                //$value[ 'level'] = $level;                $arrTree[] = $value['cid'];                unset($arrCat[$key]); //注销当前节点数据，减少已无用的遍历                self::getMenuTree($arrCat, $value[ 'cid'], $level);            }        }        return $arrTree;    }

	public function actionIndex2()	{        $filepath = Yii::getPathOfAlias('application').'/data/';        $arr = array();        $db = Yii::app()->db;        $listinfo = $db->createCommand("select name,cid,parent_cid,root_cid from item_cat_info")->queryAll();        foreach($listinfo as $val)        {            $arr[$val['cid']] = array('cid'=>$val['cid'],'name'=>$val['name'],'parent_cid'=>$val['parent_cid'],'root_cid'=>$val['root_cid']);        }        $applist = "";        file_put_contents($filepath.'itemcat.php', $applist);    }