WHMCS System Requirements

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Written by Dennis Nind

Last published at: February 8th, 2019

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 7.5 and later.

RequirementMinimumRecommended
PHP Version5.6.0Latest 7.1 or 7.2 Release
PHP Memory Limit64MB128MB**
PHP Database ExtensionPDOPDO
PHP ExtensionsCurl with SSL

GD2 Image Library
JSON Support
XML

Curl with SSL

GD2 Image Library
JSON Support
IMAP 
MBString
Iconv

MySQL Version5.2.05.5.x
Ioncube Loaders10.1.0 or laterThe latest 10.1.x version

WHMCS 7.0-7.4 supports PHP 5.6 and 7.0
WHMCS 7.5 and later supports PHP 5.6, 7.0, 7.1, and 7.2
WHMCS 7.7 supports PHP 5.6, 7.0, 7.1, 7.2 and 7.3

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 2nd April 2018.

A detailed discussion of the recommended system environment configurations (OS, Web Server, Database Engine, PHP and Ioncube) is published in the System Environment Guide.

Looking for the requirements for the earlier WHMCS 7.0 - 7.4 versions? Click here

* We validate WHMCS to run in Linux based environments running the Apache web server. Other environments such as Windows based configurations may experience compatibility issues and are not supported.

** Memory requirements vary depending upon the size and volume of activity in an installation. Your exact requirements may differ.

*** As part of PCI compliance, we recommend a SSL library capable of TLS 1.1 and/or 1.2. If using OpenSSL, version 1.0.1c or newer is recommended.