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I’m trying to implement a notification system like Quoras, where changes is marked with red and green. Red for old text and green for new. If you have a Quora account go to http://www.quora.com/notifications and you will know what I mean or just look at the example below:
Diff, match, patch is a good starting point. The downloadable zip has implementations for C++, C#, Java, JavaScript, Lua, ObjC and Python. PHP is not on the list, but you could presumably well use the JavaScript version, or port it yourself to PHP (with implementations in 7 languages, it’s probably feasible).