Padraic Brady has pointed out the "new kid in town" when it comes to magazines about PHP - Enterprise PHP:

There is a new PHP magazine called "Enterprise PHP" available in English, German and French which might even console those missing the apparently ill-fated International PHP Magazine. Back before publication the usual tree of suspects led me to being interviewed for the initial edition published a short while back.

The current issue (which you can get for free after a survey) has articles looking at testing your PHP scripts, how "professional" it is to use PHP and the fact that Java is not PHP (wait, isn't that backwards?)