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GET and POST are HTTP methods (i.e., what your web browser uses), and have nothing to do with PHP specifically. $_GET and $_POST are php variables that are automatically created and filled with the info from GET and POST requests, respectively.

If you don’t yet understand how HTTP works, particularly with regards to forms, things will go a lot smoother if you spend a few minutes on that first.

Also, if you’re “absolutely new” to PHP, you need to learn the syntax (rules for different types of code and how to make it valid) first also. What “arrays” and “strings” are, what brackets do, where semicolons go, how to use functions, and so forth. It won’t make sense if you are hazy on the basics.

Try PHP the Right Way.