How to ensure that Opcache is enabled?

Question

How to ensure that Opcache is enabled?

Answer

1. Check which PHP handler is used by the website at Domains > example.com > PHP Settings > PHP support ( PHP version ...)
   

   Note: According to PHP Documentation, OPcache is available only since PHP 5.5. For PHP 5.2, 5.3 and 5.4 it can be installed as PECL extension.

2. Check if Opcache is enabled for the domain at Domains > example.com > PHP Settings > Performance Settings > opcache.enable "on"

3. Check if Opcache is enabled for the handler at Tools & Settings > PHP Settings > handler name

Note: Opcache statistics is available at Domains > example.com > PHP Settings > View the php_info() page - cache hits, cache misses.