Validating and Sanitizing user input in PHP?

I would always consider the following mantra... "Never trust user input" ctype_alpha, ctype_alnum are good performers for validation also and remember to validate client side as well (javascript validation), this will help reduce server load as well.

I'd like to mention HTML Purifier for any HTML filtering / clean-up.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.