PHP is a scripting language that allows a site designer to perform various functions before the page is loaded. PHP is a server-side language. This means that the server takes all the load and processes each PHP script. Something like JavaScript on the other hand, is a client-side language. With JavaScript, the client's computer is used to process the code. If your looking for some beginner tutorials and such, www.3dbuzz.com has a nice set of PHP video tutorials.
Also, if you're going to use PHP you'll most likely want to use a database. I had trouble wrapping my head around databases when I began. Basically they just store information in some sort of categorized manner. MySQL is the most popular free database solution, and you shouldn't have any trouble finding resources online for it.
If you've ever dabbled in any sort of programming you'll be able to pick up PHP very easily. The syntax is simple, and all of the included functions are documented on the PHP.net site.
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