Taking PHP seriously - A post on a Slack blog, about why they implemented a backend in PHP, as well as plans for the future.
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Php
RFC: Add BigNum support to the OpenSSL extension — Since OpenSSL supports support for integers of unlimited size, it is proposed to make this feature available in the userland for PHP. For this purpose it is supposed to add class OpenSSL\BigNum . The advantage over GMP is an object implementation.
sidkshatriya / dontbug - Reversible debugger for PHP. Allows you to execute the script in steps both forward and backward. Compatible with xdebug, which means it works with any IDE. Video demonstration .
jwage / phpchunkit - Add-on PHPUnit, allows you to break large sets of tests into pieces and run in parallel.