Security for PHP and MySQL
Using the crypt function in PHP to encrypt passwords and keep them safe
How To Generate a Unique ID
PHP code to generate a random unique user ID
PHP File Upload Security Ideas
Allowing users to upload files to your website poses security risks. Here are some ideas to help protect yourself.
PHP Security Consortium
PHP Security Consortium (PHPSC) is an international group of PHP experts dedicated to promoting secure programming practices within the PHP community
Articles pertaining to creating secure PHP applications.
General MySQL Security information from mysql.com
Common Security Mistakes
Learn some of the most common security mistakes PHP programmers make, and how you can avoid them
PHP Foundations: Common Mistakes
Learn how to use 'PHP paranoia' to your advantage to write more secure scripts for use online