The PHP development team announces the immediate availability of PHP 7.1.0 Release Candidate 4. This release is the fourth release candidate for 7.1.0. All users of PHP are encouraged to test this version carefully, and report any bugs and incompatibilities in the bug tracking system. THIS IS A DEVELOPMENT PREVIEW - DO NOT USE IT IN PRODUCTION! For more information on the new features and other changes, you can read the NEWS file, or the UPGRADING file for a complete list of upgrading notes. These files can also be found in the release archive. For source downloads of PHP 7.1.0 Release Candidate 4 please visit the download page, Windows sources and binaries can be found on windows.php.net/qa/. The fifth release candidate will be released on the 27th of October. You can also read the full list of planned releases on our wiki. Thank you for helping us make PHP better.