Tips & Tricks: Input Filtering, Part 2

Tips & Tricks: Input Filtering, Part 2: Strings and Numbers
by Ben Ramsey
php|architect
August 2005

From the introduction:

You’ve heard a lot of buzz about security in PHP, lately, but you’re still confused about this ‘input filtering’ thing? Ben Ramsey lends a helping hand in part 2 of his mini-series on this technique.