XML-RPC is a remote procedure call protocol which is written in PHP. If your website have requirement for the XMLRPC libraries then you can install it either from WHM or command line, you can go with your requirements.
You can follow below steps to install extension via command line:
From this command you can install PHP extension for all PHP versions.
You can follow below steps to install extension via command line:
Code:
yum install ea-php*-php-xmlrpc