Where is if ($_GET) part handled in PHP?

From: Date: Tue, 06 May 2014 10:57:23 +0000
Subject: Where is if ($_GET) part handled in PHP?
Groups: php.internals 
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Hi,

I'm wondering where this is handled in PHP,

if ($_GET)
{

}

Clearly it's different from

if ($_GET['key'])
{

}

Anyone know  that?

Thanks

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Best Regards,
Aaron Lewis - PGP: 0x13714D33 - http://pgp.mit.edu/
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