PHP Coding Standard, which one do you prefer?

I swear by Eclipse with PHPEclipse, being a former Java developer with plenty of prior Eclipse experience. But if you want a free, and open-source alternative to Zend Studio, I highly recommend it. Debugging in Zend is typically a little more reliable and stable than in Eclipse, but it is possible in PHPEclipse and I use it quite regularly with DBG (work is being done to support XDEBUG as well).