Ivo Jansch has a reminder for developers when they're putting user data into their databases - don't use addslashes.

[Addslashes] is not the best way to escape data. The most important reason is security. addslashes can lure you into a false sense of security. As Chris Shiflett points out, there are situations that addslashes doesn't escape. Use mysql_real_escape_string instead.

Ivo also talks about the advantages of using the right function and suggests another even more secure way too - PDO.