As was announced on the main PHP.net site - the latest beta version of PHP 7.1.0 has been released with several bugfixes: PHP 7.1.0 beta 2.
The PHP development team announces the immediate availability of PHP 7.1.0 Beta 2. This release is the second beta 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.
As with other preview released, you can download them from the beta location (for source) or the Windows QA site for the Windows binaries. You can see what all changed and was fixed in this new beta in the NEWS file. The plan is to release the beta 3 version on August 18th.