Nice, I was thinking about that recently as well. We should start working on making Piwik PHP 7 compatible if not done yet. @diosmosis I reckon we also need to update travis-yml instead right? https://github.com/piwik/travis-scripts/blob/master/generator/templates/travis.yml.twig

It will be also useful to add it now so plugin developers might get some time to make sure it's working correctly with PHP 7

I presume until we have full support for PHP 7 we should run one job AllTests with PHP 7 and one job for all UiTests with PHP 7. Once PHP 7 is stable we could change to replace some jobs that currently use 5.6 with 7.0. Using PHP 7 should make our tests quite a bit faster

@ThaDafinser they seem to fail because of

The command "phpenv config-rm xdebug.ini;" failed and exited with 1 during .

https://travis-ci.org/piwik/piwik/jobs/77465717#L541

@tsteur already saw that and stopped there. I know that xdebug still lacks a bit of PHP7 support at least, but that is not the problem.

Generating autoload files
Piwik\Composer\ScriptHandler::buildXhprof
Building xhprof...
Fatal error: could not build extension (make failed)! View tmp/xhprof-logs/make.log for more info.
0.03s$ phpenv config-rm xdebug.ini;
File xdebug.ini does no exist.
The command "phpenv config-rm xdebug.ini;" failed and exited with 1 during .
Your build has been stopped.

OK, so we should not build xhprof for PHP 7?

@tsteur i disabled now xhprof and the xdebug file and the build "works now" at least partly for PHP7: https://travis-ci.org/piwik/piwik/builds/78231802

Nice, Unit tests execute 5 times faster with PHP 7 (8 seconds vs 40 seconds) if I'm seeing this right :)

@mattab when do you think will we roughly work on PHP 7 support? We should fix most important errors first as integration and system tests do not run at all currently. Won't need to merge it before having basic support for it

It would be very nice to have if LTS version was fully compatible with PHP7 - will minimise LTS related support issues in the future. Maybe we can try to get php7 support in 2.15.0?

edit: created #8689 PHP7 compatibility for Piwik

FYI: I started working on some more PHP 7 support in #8706

Let's close this PR in favor of https://github.com/piwik/piwik/pull/8706/files

Cheers @ThaDafinser for starting it