These functions can be used to write XML-RPC servers and clients. You can find more information about XML-RPC at http://www.xmlrpc.com/, and more documentation on this extension and its functions at http://xmlrpc-epi.sourceforge.net/.

The extension is unbundled from php-src as of PHP 8.0.0, because the underlying libxmlrpc has obviously been abandoned. It is recommended to reevaluate using this extension.