You'll learn something, additional career opportunities (maybe) and improved prestige among the developer community (guaranteed) come to mind.<p>It never hurts to have more than one language in your quiver. If you're looking for work and are having a hard time finding a PHP gig that suits your fancy, having some other language dialed to the point you can code in it professionally increases your odds of finding (and keeping) a job.<p>Of course, I make a good living coding PHP for high end websites, and have been for years now. I just don't talk a whole lot about the language that pays the bills since invariably mentioning PHP is your primary language leads to a torrent of hot air from other developers who use "cooler" languages. Personally, I think it's all bullshit and if folks want to play "cool kid" with their language of choice, that's fine, but don't expect me to play along.<p>Fun fact: the highest paid programmer I've met to date coded exclusively in COBOL. Think monster 1099 rates consulting on legacy mainframe code overhauls.