GOOGLE!!!
I'm sorry, but you can learn all of these things by a simple google search on your own. Just search PHP Tutorials on google.com. I did, and I found the following:
http://us3.php.net/manual/en/index.php?PHPSESSID=fa98072c67e1038c0c9abcb4094b387b
http://webmonkey.wired.com/webmonkey/01/48/index2a.html?tw=programming
http://www.freewebmasterhelp.com/tutorials/php
I could go on and on, but it would be pointless. Especially since that first link is friggin huge, and should suffice for PHP in its entirety.
Good Luck, and Have Fun!