diff на php

http://ru.php.net/manual/en/function.exec.php

внешние вызовы - не вариант. Там и Винь может оказаться.

http://ru.php.net/manual/en/function.xdiff-file-diff.php
о чо нашел :3

$ sudo pear search diff
Retrieving data...0%
.Matched packages, channel pear.php.net:
=======================================
Package             Stable/(Latest) Local
…
Text_Diff           1.1.1 (stable)        Engine for performing and rendering text diffs

не?

А это точно не обёртка для консольного diff?

хз. cygwin для офтопега не решение?

http://ru.php.net/manual/en/intro.xdiff.php

This extension uses libxdiff to implement these functions. Please see » http://www.xmailserver.org/xdiff-lib.html for more information.

The library is compatible with almost every Unix implementation (configure script) and it is also compatible with Windows through custom (nmake) make files.