PHP无限级查询类

public function _format($list)
{
foreach($list as $val){
$items[$val['id']] = $val;
}
//利用变量引用实现无限级分类
foreach ($items as $item){
$items[$item['pid']]['children'][$item['id']] = &$items[$item['id']];
}

    return $items[0]['children'];
}

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