PHP Execution Time ErrorsTroubleshoot and resolve PHP Fatal error: Maximum execution time of 300 seconds exceeded in /path/to/file.php errors in WHMCS.
PHP UpgradesTo meet WHMCS's PHP version requirements, you may need to periodically update PHP to a new supported version.
PHP Version CompatibilityYou can check your system's compatibility with PHP from within the Admin Area.
Replace Legacy Smarty TagsWe plan to permanently remove support for legacy Smarty tags in WHMCS 9.0. You must remove these tags from your customizations.
SessionsFile sessions and database sessions can help you preserve data across subsequent page loads within your custom web applications.
Smarty Security PolicySmarty Security Policies are security hardening measures that protect a system. WHMCS applies a Smarty Security Policy for system-wide use and a mail policy for stored and dynamic email-based templates.
Status Monitoring Display IssuesHow to troubleshoot and resolve display issues in Server Status Monitoring.
Stuck Installation ProcessTroubleshoot and resolve issues that cause the WHMCS installation process to stop on Step 4.
System HealthUse System Health to view your system environment status and quickly find and address issues.
System Timezone IssuesTroubleshoot and resolve timezone-related automation issues, like incorrect timestamps or cron frequency warnings.
Undefined PHPMailer Function ErrorsTroubleshoot and resolve Call to undefined function PHPMailer HPMailerscapeshellarg() errors.
Whoops Exception ErrorsTroubleshoot and resolve Whoops Exception Maximum execution time of 30 seconds exceeded errors.
Update PHP with cPanel MultiPHPYou can use cPanel's MultiPHP Manager and MultiPHP INI Editor features to upgrade PHP.