80% of the Web Powered by PHP (2017)

Today, PHP is used by more than 80% of all the websites whose server-side programming language we know. With such a large share of the web, it may or may not surprise you that more than  88% [updated 15th Dec 2017] of PHP based websites are still using PHP 5. In addition, even though PHP 7 was released more than a year ago and although it’s well documented/benchmarked as being up to 2x faster than PHP 5.6, only around 3% of PHP based websites currently use PHP 7.

Source: haydenjames.io