PHP version per subdomain / folder
While CloudLinux doesn't provide an interface to manage the PHP versions for the subdomains and/or folders, here's what you need to do.
Edit the file .htaccess, generally located at /home/yourDAlogin/domains/domain_or_subdomain/public_html/.htaccess;
Add to the first line of the .htaccess file:
ForceType application/x-httpd-phpversionhere
For example, to set it to load PHP 5.6, you'd place there:
ForceType application/x-httpd-php56
---
Enjoy! :-)