What is the most robust diff class/system/plugin for PHP? [closed]

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I know of the Text_Diff PEAR package, but is there anything more robust? I'm looking to take diffs of strings with HTML tags in them, and I'd like to know the locations of all the differences including the tags.

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The PEAR Text_Diff package is the most complete I know, however if that doesn't fit your needs you can try PHPDiff or the really simple simplediff from Paul Butler.

BTW, this has been discussed here before.

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What do you mean "for PHP?" ?

Diffs aren't language dependent. I use a diff plugin for my Text Editor (Vim).