Thx to Simon, I now find a new hobby--work out problems in Project Euler. Project Euler pose a lot questions, currently, 163 of them. by complete a question, a person can gain some genius level and access to the forum topic for that question, which features a huge amount of resource of how to do the question efficiently.

Many fields of mathematics can be learned from Project Euler, and after correctly answer all 163 questions, a amazing bragging right is up for grab. I struggled for an hour and solved 12 problems, a link to my current genius level. Wish I can get my name on money like Leonhard Euler.

PHPer think themselves superior than Java programmers, as show from this picture from lukewelling:

Ok, now I can go around in my school and be smug about the fact I know PHP... and tell all those guys in Computer Science I'm the more superior geek... with better hair...get laid more...funnier then the rest...spell "than" with "then"...