Requirements
Modifying Constants, Functions, Classes, and Methods works with all releases of PHP 4 and PHP 5. No special requirements are necessary.
Custom Superglobals are only available in PHP 4.2.0 or later.
Sandboxing requires PHP 5.1.0 or later, or PHP 5.0.0 with a special TSRM patch applied. Regardless of which version of PHP is in use it must be compiled with the --enable-maintainer-zts option. See the README file in the runkit package for additional information.
Коментарии
the author of runkit seems dropped the dev for php7....
https://github.com/zenovich/runkit/issues/87
Some one added runkit for php7 but not completed: https://github.com/runkit7/runkit7It's worth noting that the runkit7 project noted in previous comments no longer has Sandboxing support as runkit did for PHP5.