Inline diff coded in PHP

I'm looking for PHP code that will produce diff's between two texts, and render them "inline". By that I mean not the standard *nix diff output, which compares and outputs lines, but a diff that compares inline text and outputs the bits before and after in place, marked with a custom <span> or something. Example of *nix diff: - this is the old line + this is the new line Example of what I need: this is the <span class="old">old</span> <span class="new">new</span> line I've seen this done in the htmldiff package, which is a C program. Except I don't want to diff HTML code, but regular text. I actually need this for a wiki engine, so it can present diffs between page changes in a better way. So: * Anybody seen such code? the PEAR diff only does line diffs. * Know of any GPL'd wiki engine which has my kind of diffs already implemented (as PHP?) * Any pointers about how I should go about writing my own such diff? -- Romanian Web Developers - http://ROWD.ORG