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Anything less than a complete web application, I suspect. If you just want special functionality on a particular page, or set of pages, PHP would probably do pretty well. If you wanted to design a web-based application of some kind, and the functionality needed wasn't readily available from an open source project somewhere, then I'd advise using a Ruby on Rails-like platform.
I hear CakePHP is pretty good too; essentially PHP on Rails. It suffers from the limitations of PHP; Python and Ruby far outstrip PHP in terms of functionality and elegance. But CakePHP seems like a nice "middle way" between straight PHP and Rails.
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