Some quick links to PHP Twitter APIs.

http://code.google.com/p/twitter-php/ lightweight
http://blog.slawcup.com/2007/04/full-twitter-php-library-ver-01/
http://classes.verkoyen.eu/twitter/
http://www.phpclasses.org/browse/package/4075.html

Oh yes, and finally the most obvious one:
http://apiwiki.twitter.com/Libraries#PHP

There are also bindings for Python, Ruby, Perl and all other flavours

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