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.
Troubleshoot and resolve Segmentation fault errors.
File sessions and database sessions can help you preserve data across subsequent page loads within your custom web applications.
Smarty Security Policies are security hardening measures that protect a system.