PHP 5.6 will only be supported on our servers until December 2020. After that the default version of the PHP settings will automatically be changed to PHP 7.1 (you can change) this at any time.
PHP 7 is a new major version. Basically nothing should stand in the way of a problem-free migration from PHP 5.6 to 7.1, but we recommend that you clarify the following points in advance:
Due to some remote functionalities in PHP 7.1, existing codes have to be tested with the new version to be on the safe side and code adjustments have to be made. The most important changes are:
| PHP 5 - up to now | ${$foo['bar']['baz']} |
| PHP 7 - new | ($$foo)['bar']['baz'] ) |
All the uncompatible functionalities that apply to the versions of PHP 7 are listed in detail on the official PHP website under «Migrating from PHP 5.6 to PHP 7».
The phan und phpstan tools will help you check your code for compatibility with PHP 7.1.
The most commonly used CMS (Content-Management-Systems) in the current versions are all compatible with PHP 7, as follows:
| Contao | Version 3.5.5 or higher |
| Drupal | Drupal 7 as well as Drupal 8 |
| Joomla | Version 3.5 Version 3.7 or higher compatible with PHP 7.1 |
| Typo 3 | Version 7 LTS and higher |
| WordPress | Version 4.4 or higher |
| WP Plugins & Themes | Checking with the Plugin «PHP Compatibility Checker» |