php获取分类以下的全部子类方法

static function getMenuTree($arrCat, $parent_id = 0, $level = 0,$all=True)
{
static  $arrTree; //使用static取代global
if(!$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[$key]); //注销当前节点数据，降低已没用的遍历
self::getMenuTree($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']);
}

$applist = "<?php\nreturn ".var_export($arr, true).";\n?>";
file_put_contents($filepath.'itemcat.php', $applist);
}