Version 5.x System Requirements
From WHMCS Documentation
Most current web servers with PHP & MySQL installed will be capable of running WHMCS. However, the specific system requirements are:
- Windows or Linux OS
- PHP Version 5.0.x - 5.4.x (with JSON)
- MySQL Version 4.1.x and above (Strict Mode Disabled)
- Curl Support (with SSL)
- GD2 Image Library
- Ioncube Loaders 4.x or later
Note: PHP Version 5.5 is not supported at this time.
If you would like any more information or need help in determining if your server meets these requirements, please contact us.