I was in the exact situation a year or so ago. Everything I wanted to build, I always went straight to PHP.

I stopped myself from, unfortunately, not building things. I've spent the last year learning Ruby, Python, Rails, Django, and a half dozen javascript frameworks to get myself acquainted with it all. Only recently I took a position where I'll be working with Rails full-time. It's a tough addiction to break, but it's so liberating once you learn what else is out there and what you can do with it!