We (https://judson.biz https://judson.biz) switched to PHP7 in production last month. I need to review the git commits, but our modern (~2yr old, running PHP 5.

We (https://judson.biz https://judson.biz) switched to PHP7 in production last month. I need to review the git commits, but our modern (~2yr old, running PHP 5.6) customer frontend and admin backend were very close to production-ready without any work. Our 10 year old inventory/vendor backend that relied on the (now removed) mysql_* calls needed to be shimmed[0]. Our largest benefit was a significant drop (50%+) in memory usage when allocating lots of objects (which we do when pre-fetching ORM relationships), and a significant reduction (40%, 100-200ms) in render latency when rendering many partial product templates. Edit: One thing that did bite us post-rollout, which didn't show up in development was this php7-fpm bug[1]. [0]: https://github.com/dshafik/php7-mysql-shim https://github.com/dshafik/php7-mysql-shim [1]: https://github.com/php/php-src/pull/1720 https://github.com/php/php-src/pull/1720