For seven years, PHP has been the fourth most popular programming language, driving the world's more than 2 sites, more than 81.7 of the world's public web sites in the server PHP. PHP has been the biggest leap since 2004, since PHP 7 has been released. The biggest feature of PHP 7 is that it has greatly improved the performance, and the performance can reach 5.6 times of PHP 3 in some WordPress benchmarks.
PHP 7 there are some other small improvements, such as a significant reduction in memory usage, add a return type declaration and so on. PHP 7 contains a number of major security improvements, such as the removal of the PHP security model, add magic quotes, there are a number of new reserved keywords and so on. This means that WordPress and other Web applications need to be part of the re design, so as to prepare for the PHP 7 release, and now WordPress seems to have been fully compatible with PHP 7.
Although PHP 7 has been released, but it takes a few years for a wide range of applications, Web applications, especially for the enterprise Web application, it takes a few years to upgrade to the new version of the platform. However, many Web developers believe that the huge performance improvement of PHP 7 is very attractive to them.