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 5.6.x Release |
| 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 |
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.