PHP extracting without extract()

Question

I have something like:

    if(isset($_POST['submit']))
    {
    $linktitle=strtolower(str_replace(" ","-",$title));

etc.

$linktitle and $title are actually variables from $_POST - ie $_POST['linktitle'] and $_POST['title']. Somehow, even though (as far as I can see!) I haven't extract()ed $_POST at this stage in the code, it is still working - PHP is understanding that $title is referring to $_POST['title']. Could anyone please explain why this might be?

Thanks!

ps. Sorry, but I really can't get this inline code quote formatting thing to work...!

DaveRandom · Accepted Answer · 2012-01-24 17:32:58Z

3

register_globals is enabled in your PHP instance. See here for more info.

This is behaviour that should be relied upon as it's use is now deprecated. You will find that you can still use $_POST['keyname'] as well as $keyname, and that is what you should refer to in your code.

answered Jan 24, 2012 at 17:32

DaveRandom

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Niet the Dark Absol · Accepted Answer · 2012-01-24 17:33:19Z

1

Your php.ini file must have register_globals enabled, so GPC variables are being added to the symbol table. This is why you see this behaviour. See the security risks of such a feature here

answered Jan 24, 2012 at 17:33

Niet the Dark Absol

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Community · Accepted Answer · 2023-11-17 19:59:20Z

1

You have register globals activated in your webserver (php.ini), so PHP replace the unknoe variables with the corresponding GET or POST value. This option is deprecated and dangerous! Disable it if you can!

edited Nov 17, 2023 at 19:59

CommunityBot

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answered Jan 24, 2012 at 17:36

ocirocir

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