UPDATE 2: While testing PHP 7 Release Candidate 7, we encountered some security issues. So, for your security, we decided not to release PHP 7 RC 7 for testing, as previously announced. Once the next version of PHP 7 becomes available on November 26th, we will review it and – if it meets our requirements – make it available for testing.
UPDATE: PHP 7 was scheduled for a release on November 12th. Due to some critical bugs in PHP 7 RC 6, this release was pushed back by two weeks. According to the PHP timetable, PHP 7 will be released on November 26th.
Test PHP 7 with your 1&1 websites
Not for use on production systems: PHP 7 beta is not intended for use on production systems. For this reason, we recommend testing this PHP version on a copy of your website. You can also create a subdomain and switch it to PHP 7 beta.
You can now test PHP 7 RC 3 with your 1&1 Websites. RC 3 fixes 19 bugs and includes over 100 commits with improvements from the PHP community.
PHP 7 RC 3 at 1&1 gives you the opportunity to test the advantages of PHP 7 on your website under real conditions. You can check your PHP code, test external and core extensions, and plan your own personal transition to PHP 7.
You can enable PHP 7 RC 3 for selected websites/domains in the 1&1 Control-Panel. No worries: you can switch back to an older PHP-Version after testing.
Not for use on production systems: PHP 7 RC 3 is not intended for use on production systems. For this reason, we recommend testing this PHP version on a copy of your website. You can also create a subdomain and switch it to PHP 7 RC 3.
Twice the performance of PHP 5.6
PHP 7 will significantly benefit most web applications – the performance is increased considerably, and in most cases even doubled (in req./second). The performance optimizations in PHP 7 offer even greater advantages for popular CMSs like WordPress. (Source)
The release of PHP 7 with full 64-bit support is currently scheduled for November 2015.