> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://krystal-dev.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Enabling Ioncube loader (and other PHP extensions)

The Ioncube loader PHP extension is often required for WHMCS.

It can be enabled within **cPanel > SOFTWARE > Select PHP version** on the PHP Selector | Extensions page.

![](https://storage.crisp.chat/users/helpdesk/website/3f23a3f840d7aa00/f1fa2c61-d6e1-40fe-9926-accfc4_b0d95y.jpeg)

Simply tick the **ioncube_loader** checkbox - your change will be saved automatically.

We have a separate guide that explains more about [Changing your PHP version, modules, settings and functions](/article/r5povadnfa-changing-your-php-version-modules-setting-and-functions).

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