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Their is always the PHP Debugger, it's an addon to many of the editors out there. Zend Studio has it inside the package, and I am sure there are other editors that also include it in the package.
thanks for the link, exactly what I was looking for
if I can avoid printf-debugger I do. At least since a customer ringed in to tell us that after 100 times he gets bored of clicking the 'Hallo Fred'-mesages boxes away. (fortunately not my fault )