I began learning PHP at php.net and that's the only source I've ever used. They have a complete manual that is perfect. It's not humorous like most books, but it's free and gets the job done. MySQL I like to look at http://www.tizag.com/mysqlTutorial/. I often refer back to it if I forget.
Some good cheat sheets for what you're learning...
http://www.ilovejackdaniels.com/html-cheat-sheet.pdf
http://www.ilovejackdaniels.com/mysql_cheat_sheet.pdf
http://www.ilovejackdaniels.com/css_cheat_sheet.pdf
http://www.ilovejackdaniels.com/php_cheat_sheet.pdf
Some extra cheat sheets...
http://www.ilovejackdaniels.com/reg...cheat_sheet.pdf
http://www.ilovejackdaniels.com/mod...cheat_sheet.pdf
Hope I helped.

