Description of problem: MediaWiki is not compatible with PHP 5.3.1 due to a bug in that release, which is fixed in PHP 5.3.2. This release of MediaWiki will refuse to upgrade if an affected version of PHP is present. Note that local or distribution-specific backports of the PHP bug fix are supported. See http://bugs.php.net/50394 for details.
As php 5.3.2 fixes this issue, I close this bug as duplicate of PHP 5.3.2 available. *** This bug has been marked as a duplicate of bug 570769 ***