If you're already familiar with ASP and programming in general you may be able to learn PHP from the online PHP manual:

http://www.php.net/manual/en/

Bear in mind that many shared hosts still have PHP 4 installed so be aware of the version you're reading up on.

And you may be able to do the same thing for MySQL since you know SQL already:
http://dev.mysql.com/doc/refman/4.1/en/

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