>This function I don't get at all, I hear all the time, "if you want to
>practice smart coding then turn register globals off, and be sure you keep
>query data out of your script that is not set or defined with something
>expected". So why would there be a function that returns true or false, $var
>is empty even if $var is not defined!

It's just a shorthand that helps avoid tests like the one below, common in
a user input validation situation:

        (!isset($_POST['var']) || ($_POST['var'] == ''))

Instead, you can use:

        empty($_POST['var'])

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