System Requirements
From WHMCS Documentation
Most current web servers with PHP & MySQL installed will be capable of running WHMCS.
The following table shows the minimum and recommended system requirements for running WHMCS 6.0 and later.
| Requirement | Minimum | Recommended |
|---|---|---|
| PHP Version | 5.3.7 | Latest 5.4.x Release or Later |
| PHP Memory Limit | 64MB | 128MB* |
| PHP Database Extension | PDO | PDO |
| PHP Extensions | Curl with SSL GD2 Image Library |
Curl with SSL GD2 Image Library |
| MySQL Version | 5.1.0 | 5.5.x |
| Ioncube Loaders | 4.6.1 | 4.7.5 |
WHMCS Version 6.0 supports PHP 5.3.7 or Later, including PHP 5.4.x, 5.5.x and 5.6.x.
While these are the minimum requirements, we strongly recommend using the latest available, stable releases of all software and extensions. Recommended suggestions are correct as at 3rd April 2015.
* Memory requirements vary depending upon the size and volume of activity in an installation. Your exact requirements may differ.