Troubleshoot and resolve warnings about the OPcache PHP extension.
WHMCS may return PHP errors and exceptions if errors occur.
You can view information about your PHP configuration from within the Admin Area.
To meet WHMCS's PHP version requirements, you may need to periodically update PHP to a new supported version.
You can check your system's compatibility with PHP from within the Admin Area.
We plan to permanently remove support for legacy Smarty tags in WHMCS 9.0. You must remove these tags from your customizations.
Troubleshoot and resolve Required function is not available errors.