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I just wanted to let you know that after upgrading one of my forums from 2.2.1 to 2.3 there was a PHP Fatal error:
PHP Fatal error: require_once(): Failed opening required '/home/username/public_html/vendor/autoload.php' (include_path='.:/opt/cpanel/ea-php56/root/usr/share/pear') in /home/username/public_html/bootstrap.php on line 50
Fortunately to me, I decided to switch to PHP 7.x right away and by doing so, the site was magically fixed and no further PHP errors came up.