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Stuff like this hurts: https://www.drupal.org/node/2454439

Of note: that issue has been ongoing for months, and most of the issues that were found were fixed in PHP core within a few days/weeks. Drupal 8's test suite even caught one regression that delayed the PHP 7.0.0 final release a few weeks!

Most modern PHP apps will work on PHP 7.0.0 with little or no extra effort, but if you have a large legacy app, and haven't ever turned on error logging, you may need to fix a bunch of deprecated code usage!

It really does. I work partly on a 10 year old PHP software. PHP 7 has apart from some other breakages some changes in the evaluation order that I expect to break everything. Thankfully related to objects, so with a bit of luck it will mostly hit the bundled libs (the project of course does not use objects for its own structure) which can then be exchanged or maybe will get updates.

Lots of work.

Why? It says there is a 100% test pass rate on PHP7.

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