$_POST ?

Basically, it’s an array of values recieved from a form post. If you have an input with the name blah and you enter “foobar” into it, $_POST['blah'] will be set to “foobar” after you submit the form.

And while we’re on reserved variables, $_GET is the stuff from the URL.

script.php?blah=foobar results in $_GET['blah'] being set to “foobar”.