Set up properly and monitor your Zend OPcache with this dashboard that will help you checking memory, hits and status, configuring for optimal performance (warning you when cache full, validation, etc.) and reseting one or all scripts with one click.
composer require carlosio/opcache-dashboard
Then you can symlink it to your public folder or require it from another php file.
Or just copy and paste
opcache.php anywhere in your public folder. You can use something such as:
Try to keep it safe for non authorized users.