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Bug #17874 var_export prints to screen
Submitted: 2002-06-20 11:47 UTC Modified: 2002-06-20 12:12 UTC
From: che at atlantic dot net Assigned:
Status: Not a bug Package: Output Control
PHP Version: 4.2.0 OS: Windows 2000
Private report: No CVE-ID: None
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From: che at atlantic dot net
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 [2002-06-20 11:47 UTC] che at atlantic dot net 
The code below outputs to the screen. (Even with output buffering)

ob_start();
$v = var_export($GLOBALS, TRUE);
ob_end_clean();

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 [2002-06-20 12:02 UTC] che at atlantic dot net 
This is because GLOBALS is recursively linked to itself and it is causing var_export to die.
 [2002-06-20 12:12 UTC] sander@php.net 
Not a b. var_export() dies in recursive arrays. var_export() uses output buffering internally to deal with the second parameter. The (internal) ob_end_clean() call will never make it because PHP dies before it reaches that point and then it just outputs all buffers.
 [2003-09-14 11:20 UTC] icecube at fr dot fm 
<?
$foo=var_export($GLOBALS,TRUE);
?>
(whithout or not output buffering).

It's the same problem: var_export outputs to the screen $GLOBALS and then die with an error message.


So that's not a bug...
Ok now imagine you're using a this script in in your website, and you haven't noticed that error.
With an example it's more easy to understand:
<?

function save_anywhere($foo) {
$save=var_export($foo,TRUE);
/* ... */
}

save_anywhere(&$GLOBALS);

?>

You wish to save $GLOBALS for a any reason (log, ...) and what's the result ? var_export produces an error and outputs ALL your variables directly to the user, wich now can hack your site just because he has your $mdp = "..." :)


It's maybe not necessary to output a variable that was destinated (with the second parameter TRUE) to be stocked anywhere except in the user HD.
 
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