This is a newbie question.
What are the general things to pay attention too when handling data that were sent from a form?
The form has a few text widgets, a couple of comboboxes, a hidden text field, and two jQuery datepickers.
I was thinking of writing a loop in PHP to check for the length, and possibly the pattern using regexes.
If you know of a good pratical article that explains how to handle forms safely, I'm interested.