The goal of this issue is to verify and ensure that Piwik is fully compatible with PHP7.

PHP7 will surely be quickly adopted by the PHP community. By officially supporting PHP7 our community will be able to enjoy the latest PHP running their Piwik platform.

• PHP7 compatibility: rename sparkline constructors to __construct #8410
• Piwik can’t be installed on PHP7 due to the removal of $HTTP_RAW_POST_DATA #8812
• started working on PHP 7 support #8706
• activate / deactivate plugin does not work possibly because of some issues with references see started working on PHP 7 support #8706 (comment), fixed in this PR
• Many usort / uasort need to be adjusted to make tests work started doing it in https://github.com/piwik/piwik/compare/8689_2
• PHP 7 compatible PclZip version component-decompress#5 Issues with zip
• PHP7 Compatibility: installation, using most features: Piwik should work on PHP7! Major progress in PHP7 Compatibility for Piwik #8893
• PHP 7 compatibility component-decompress#4 Issues with tar
• add CI build for PHP7 eg. Adding PHP7 build on travis #8648 [WIP] enable php7 travis #9858
• PHP7, API: actual error messages not shown when a PHP Error occurs #10115
• Transitions do not work #10269