Edit report at http://bugs.php.net/bug.php?id=51907&edit=1
ID: 51907
User updated by: danieln at javanet dot com
Reported by: danieln at javanet dot com
Summary: $_SESSION nested array is lost when a foreach() dummy
name matches array name
-Status: Open
+Status: Closed
Type: Bug
Package: Session related
Operating System: Linux
PHP Version: 5.2.13
New Comment:
Solved - Not a bug. Sorry for false alarm. I was not aware of the
"register_global" php.ini setting, which merges the scope of local and
superglobal arrays.
Previous Comments:
------------------------------------------------------------------------
[2010-05-25 19:54:07] danieln at javanet dot com
Description:
------------
I'd appreciate confirmation that the following is a bug with PHP 5.2.13,
and apologies if I'm mistaken.
The following complete PHP script crashes the 3rd time it is run. The
foreach() loop seems to have an (improper) side effect which wipes out
the nested $_SESSION array because the internal variable used in the
loop matches the name of the nested $_SESSION array. Simply changing
the name of the internal foreach() variable to something different fixes
the problem.
Note: clear session variables before running script 3 times.
Again, changing "$breadcrumb" to "$the_breadcrumb" fixes the problem.
But the foreach() loop should have no side effects. Note: since the
scope of $breadcrumb is not the same as the scope of
$_SESSION["breadcrumb"], there should be no collision.
Note that doing a print_r() on the array shows the array as (correctly)
empty the first time, (correctly) populated the second time, and
erroneously set as "Array ( [breadcrumb] => trail )" the third time (the
nested array has been wiped out).
The error in the PHP error log from the 3rd run:
PHP Fatal error: Cannot use string offset as an array on line 5
The issue is not a problem on PHP 5.3 - only PHP 5.2.13. I could not
find any note regarding this issue in the PHP changelog, and I must use
5.2.13 on my live site, so I'm posting here for confirmation that this
is a PHP 5.2 bug.
Thanks,
Dan Nissenbaum
Test script:
---------------
<?php
session_start();
if (!is_array($_SESSION["breadcrumb"]["trail"]))
{
$_SESSION["breadcrumb"]["trail"][] = "trail";
}
foreach ($_SESSION["breadcrumb"]["trail"] as $breadcrumb)
{
echo $breadcrumb;
}
?>
Expected result:
----------------
No PHP 5.2.13 crash on line 5.
Actual result:
--------------
PHP 5.2.13 crashes on line 5.
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/bug.php?id=51907&edit=1
