Here is a list of some of the most popular sites for mySQL and php help. Please leave some comments with some more sites to add to the list.
Official Web sites:
Tutorials and Articles:
The Scripts.com: http://www.thescripts.com/serversidescripting/php/
Zend Dev Zone: http://www.zend.com/developers.php
SitePoint PHP & mySQL Tips: http://www.sitepoint.com/subcat/98
CodeWalkers Tutorials: http://codewalkers.com/tutorials.php
PHP freaks: http://www.phpfreaks.com/
PHP Intro (written by the creators): http://www.zend.com/zend/art/intro.php
AMP Bundles (Apache/mySQL/PHP)
Sokkit (formerly known as PHPTriad): http://www.phpgeek.com/
WAMP Server: http://www.wampserver.com/
I hope that these help you with you learning process with php and mySQL.