The PHP development team is proud to announce the immediate availability of PHP 5.4.0. This release is a major leap forward in the 5.x series, which includes a large number of new features and bug fixes.

Some of the key new features include: traits, a shortened array syntax, a built-in webserver for testing purposes and more. PHP 5.4.0 significantly improves performance, memory footprint and fixes over 100 bugs.

For users upgrading from PHP 5.3 there is a migration guide available here, detailing the changes between those releases and PHP 5.4.0.

Further details about the PHP 5.4.0 release can be found in the release announcement, and the full list of changes are available in the ChangeLog.

Please note that it may take a while until the release is available on all mirrors.

The PHP development team would like to announce the immediate availability of PHP 5.3.10. This release delivers a critical security fix.

Security Fixes in PHP 5.3.10:

• Fixed arbitrary remote code execution vulnerability reported by Stefan Esser, CVE-2012-0830.

All users are strongly encouraged to upgrade to PHP 5.3.10.

For source downloads please visit our downloads page, Windows binaries can be found on windows.php.net/download/.

The PHP development team would like to announce the immediate availability of PHP 5.3.9. This release focuses on improving the stability of the PHP 5.3.x branch with over 90 bug fixes, some of which are security related.

Security Enhancements and Fixes in PHP 5.3.9:

• Added max_input_vars directive to prevent attacks based on hash collisions. (CVE-2011-4885)
• Fixed bug #60150 (Integer overflow during the parsing of invalid exif header). (CVE-2011-4566)

Key enhancements in PHP 5.3.9 include:

• Fixed bug #55475 (is_a() triggers autoloader, new optional 3rd argument to is_a and is_subclass_of).
• Fixed bug #55609 (mysqlnd cannot be built shared)
• Many changes to the FPM SAPI module

For a full list of changes in PHP 5.3.9, see the ChangeLog. For source downloads please visit our downloads page, Windows binaries can be found on windows.php.net/download/.

All users are strongly encouraged to upgrade to PHP 5.3.9.