private function gettreeitems($items){
$tree = array();
foreach ($items as $item) {
if(isset($items[$item['pid']])){
$items[$item['pid']]['children'][] = &$items[$item['mid']];
}else{
$tree[] = &$items[$item['mid']];
}
}
return $tree;
}
谁能帮我解释一下,这个方法里面&的意思,为什么少了&,结果就错误了呢?