Testing

[eluser]Jim Higgins[/eluser]
I came across these in an online presentation while searching the topic myself.

Unit Testing:
PHP Unit
SimpleTest

System Testing:
Selenium + PHP Unit

Performance, Stress, Load, Reliability, Availability
ab, httperf, JMeter, Grinder, OpenSTA

Security
Chorizo + PHP Unit

Here is the presentation...
http://www.slideshare.net/sebastian_berg...d-selenium

Also, I know .Net Magazine did a story on automated security testing and I think they ranked them. I have the magazine around still I'm sure (I save them all). Let me know if you'd like me to dig through and try and find it.

Good luck and let me know what you both end up choosing to do.