Go to the source
[link|http://zend.com|Zend], the people who make PHP, make an IDE. Those who like that sort of thing seemed to like it just fine. Me, I like vim, but I'm weird like that.
Obligatory side note on IDEs: I think they're probably great for rapid development of completely new apps, but get in the way when you have an established framework. So for a ColdFusion guy going over to PHP it's probably a good idea.
Oh, I think the IDE's written in Java. FWIW
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