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Bug #55193 virtual() loop with null parameter
Submitted: 2011-07-12 15:04 UTC Modified: 2011-09-17 09:12 UTC
From: jinmoku at hotmail dot com Assigned:
Status: Not a bug Package: Apache2 related
PHP Version: 5.4.0alpha1 OS: OSX 10.6
Private report: No CVE-ID: None
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 [2011-07-12 15:04 UTC] jinmoku at hotmail dot com 
Description:
------------
virtual() loop with null parameter, loop 9 times before it stop

Test script:
---------------
var_dump('test');
virtual(null); // or virtual('');

Expected result:
----------------
string(4) "test"

Warning: virtual(): Unable to include '' - error finding URI


Actual result:
--------------
string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

string(4) "test"

Warning: virtual(): Unable to include '' - error finding URI

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 [2011-09-17 09:12 UTC] nikic@php.net
-Status: Open +Status: Bogus
 [2011-09-17 09:12 UTC] nikic@php.net 
As far as I see it this is expected behavior.

I'm assuming that you are running the file as index.php and thus the same file get's included again and again, recursively. Apache stops the recursive inclusion after 10 subrequests, which is the default value for LimitInternalRecursion.

PHP does not prevent recursive subrequests by itself as they are useful as long as you break out of the recursion at some point. For the same reason you can also include/require a file recursively.
 
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