On the Hauser & Wenz blog today, Christian Wenz points out a patched version of the interactive command line PHP client, phpa to work on a Mac OS X machine - phpa-norl.

phpa is an interactive command line shell for PHP by David Phillips. Stefan Fischerlander, usually known as a SEO expert and Perl admirer, has patched phpa for Mac OS X and Windows (the default builds theredo not seem to support a feature required by phpa). The result: phpa-norl. Stefan successfully ran this on OS X, and I could confirm that it runs on Windows, as well

He also mentions some features of the client including a history feature that makes looking back through previous commands simple.