So, doesn't look like it's a PHP version issue-
Would be great if there were a more 'user level' way (like pockethold) to install and use a Flarum beta. We're trying to find a kind of forum that has more of the immediacy of Slack while retaining a forum thread architecture to use for real-time audience feedback during live streaming audio broadcasts. So far, this is the most appealing thing I've found! Great work to the developers!