What security issues should I look out for in PHP

Question

I just starting out learning PHP, I\'ve been developing web apps in ASP.Net for a long time. I was wondering if there are any PHP specific security mistakes that I should be

Answer 1

Whenever possible, use prepared statements (tutorial. It's almost a must whenever dealing with user input (I say "almost" because there are a few use cases where they don't work), and even when not dealing with input, they keep you in the habit. Not to mention they can lead to better performance, and are a LOT easier, once you get into the swing of things, than piecemeal sanitizing.