I am currently experimenting with the Yii framework and I had some troubles running the yiic utility from Windows command prompt using the EasyPHP WAMP stack (I normally work on a Mac, but I wanted to make it work on Windows too).
While the stack works fine from a web browser, invoking PHP from its home directory under EasyPHP would raise a lot of warnings, mostly complaining about missing DLL extensions. Really annoying! It turns out php.exe cannot find its configuration file php.ini. Off to fix it.