Version 5.x System Requirements
From WHMCS Documentation
Most current web servers with PHP & MySQL installed will be capable of running WHMCS. The minimum requirements are:
- Linux or Windows OS
- PHP Version 5.2.x - 5.4.x
- JSON Enabled
- PHP Memory Limit: 64M (minimum)
- MySQL Version 4.1.x and above (Strict Mode Disabled)
- Curl Support (with SSL)
- GD2 Image Library
- Ioncube Loaders V4.0 or later
PHP 5.5 Compatibility
PHP Version 5.5 is not supported at the current time due to Ioncube encoding restrictions.
If you would like any more information or need help in determining if your server meets these requirements, please contact us.