They take in a function as a parameter to use when a match is found. This function receives the match array as a parameter and returns a modified string that is used as a replacement.
你可以为preg_replace_callback指定某个函数为参数，此函数能接收匹配结果数组为参数，并将数组修改后返回，作为替换的结果。
Both versions take a function to apply at each node that returns a replacement node (or the original node).
两个版本均在各节点应用一个函数来返回替换的节点(或原始节点)。
If Kyoto is scrapped, it could take several years to negotiate a replacement framework, the source added, a delay that could strike a terminal blow at efforts to prevent dangerous climate change.
如果《京都协议书》被丢弃，那么将需要几年的时间来议定一个新的替代框架。消息来源补充道，任何延迟都是对防止危险气候变化的种种努力的致命打击。
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