When using cPanel the way to enable allow_url_include directive locally (per user) is to create an Virtual Host include:

First create an include file:

Add directive to custom.conf:

php_admin_flag allow_url_include On

Then run to enable include:
/scripts/ensure_vhost_includes --user=username --verbose

Alternatively, enabling allow_url_include globally (server-wide) is done by editing /usr/local/lib/php.ini and adding “allow_url_include = On” directive to the Fopen wrapper section.
; Fopen wrappers ;

;Whether to allow the treatment of URLs (like http:// or ftp://) as files.
allow_url_fopen = On
allow_url_include = On

and restarting apache by issuing “service httpd restart” command as root.