PHPCon Poland 2024

PHP 5.1.0. Release Announcement

The PHP development team is proud to announce the release of PHP PHP 5.1.0.
Some of the key features of PHP 5.1.0 include:

For a full list of changes in PHP 5.1.0, see the ChangeLog.

In addition to new features, this release includes a number of important security fixes:

All users of PHP 5.0 and early adopters of 5.1 betas are strongly advised to upgrade to 5.1 as soon as possible. Furthermore, 5.1 branch obsoletes the 5.0 PHP branch.

Upgrading Guide is available to ease the transition from prior PHP versions.

To Top