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求好手解读一小段无限分类代码,

WBOY
WBOYOriginal
2016-06-13 12:38:30859browse

求高手解读一小段无限分类代码,,,
foreach ($rows as $id => $item)
    {
if ($item['pid'])
    {
$rows[$item['pid']][$item['id']] = &$rows[$item['id']]; //主要是这一部分,能详细说明下吗?
$t[] = $id;
}
}

无限分类
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