In a new post to his blog Kore Nordmann talks about quality assurance tools they've been using for their development process - PHP_Depend and phpUnderControl.
Some of the most important tools for quality assurance in PHP projects are PHP_Depend and PhpUnderControl. In the future Qafoo - passion for software quality will provide support for both.
He talks a bit about each tool and how they should be used to find and treat a lot of the issues that could come up in your application development. Since the author of the PHP_Depend tool, Manuel Pichler, works for the company, they'll be supporting it as well as offering services for integrating it into your workflow.