//传递一个父级分类ID，返回所有子分类ID
Static Public function getChildsId($cate,$pid){
$arr=array();
foreach ($cate as $v){
if ($v['pid']==$pid){
$arr[]=$v['id'];
//$arr[]=$v['name'];
//$arr[]=$v;
$arr=array_merge($arr,self::getChildsId($cate,$v['id']));
}
}
return $arr;
}