A question on predefined variables

[Le Poisson]

My apologies if my question sounds childish. Please explain the
following code to me. I found it at the beginning of a script.

if (isset($_REQUEST['GLOBALS']) OR isset($_FILES['GLOBALS']))
{
echo 'Request tainting attempted.';
exit;
}

Also, I'll be very grateful if someone can suggest me a good reference
on predefined variables. (The one included in PHP Manual didn't help
much.)

Thanks a lot.

[flamer die.spam]

Le Poisson wrote:

My apologies if my question sounds childish. Please explain the
following code to me. I found it at the beginning of a script.

if (isset($_REQUEST['GLOBALS']) OR isset($_FILES['GLOBALS']))
{
echo 'Request tainting attempted.';
exit;
}

Also, I'll be very grateful if someone can suggest me a good reference
on predefined variables. (The one included in PHP Manual didn't help
much.)

Thanks a lot.

Its saying if $globals has a value then exit the script, ie. its trying
to prevent people from setting values themselves.. google has many
great php resources.

Flamer.