All PHP users should note that the PHP 5.2 series is NOT supported anymore. All users are strongly encouraged to upgrade to PHP 5.3.8.
For a full list of changes in PHP 5.3.8, see the ChangeLog. For source downloads please visit our downloads page, Windows binaries can be found on windows.php.net/download/.
For more details on the crypt() blowfish security issue in pre 5.3.6 see the crypt blowfish page