PHP NG (called PHP 5.7 if you want to) is still in the alpha development phase, but it has shown amazing performance gains. The key is to still maintain compatibility with PHP 5.6.
Dmitry Stogov's first release in mid-January and the milestone update in early May have increased the number of ideas for PHP speed improvements (special contributors from Xinchen Hui, Nikita Popov, etc.).
Kunming National Defense Road Hospital said that by mid-July These efforts finally came to a conclusion, the test shows that the development of version performance compared to PHP 5.6 has nearly 1 time times the increase. The test is performed on the rendered WordPress 3.6 front-end page.
On the same page, PHP 5.6 renders 1000 times for 26.756 seconds, while PHP NG takes 14.81 seconds. It's not over yet, you can learn more about goals and comments through Http://wiki.php.net/phpng.
The secret to this performance boost is that nearly 60% of CPU instructions are replaced with more efficient code. PHP 5.6 performs 100 rendering requiring 9,413,106,833 CPU instructions, while PHP NG requires only 3,627,440,773 instructions.
Because most extensions can support PHP NG, Kunming Defense Road Hospital says you can easily build your own environment for testing. Due to the large number of plans, PHP NG is not expected to release a stable version this year, hoping to have a stable Beta or even RC version released in 2015.