你可以使用 copy（） 功能： / p>

  //将foo / test.php复制到bar / test.php 
 //如果需要，重写它
 copy（'foo / test.php'，'bar / test.php'）; 
 

从手册页面引用几个相关的句子：

将文件源的副本复制到
dest。

如果目标
文件已经存在，它将被覆盖
。

Say I've got a file test.php in foo directory as well as bar. How can I replace bar/test.php with foo/test.php using PHP? I'm on Windows XP, a cross platform solution would be great but windows preferred.

You could use the copy() function :

// Will copy foo/test.php to bar/test.php
// overwritting it if necessary
copy('foo/test.php', 'bar/test.php');

Quoting a couple of relevant sentences from its manual page :

Makes a copy of the file source to dest.

If the destination file already exists, it will be overwritten.