I've been doing some work with PHPLens today. It installs nicely on OS X. I'm running Aaron Faby's Complete PHP. Complete PHP does not include the Zend Optimizer which is required for PHPlens. It is easy to get the optimizer from the ZEND website and install it into the Complete PHP setup. The only thing it takes is changing a few of the configuration lines (which the installer asks you about when you run it).