system/classes/rpcclient.php

<?php
namespace Habari;
class RPCClient
{
  private $url;
  private $method;
  private $params;
  private $request_body;
  private $result = false;

  function __construct( $url, $method, $params )
  {
    if ( ! function_exists( 'xmlrpc_encode_request' ) ) {
      return Error::raise( _t( 'xmlrpc extension not found' ) );
    }
    $this->url = $url;
    $this->method = $method;
    $this->params = $params;

    $this->request_body = xmlrpc_encode_request( $method, $params );
  }

  public function execute()
  {
    $rr = new RemoteRequest( $this->url, 'POST' );
    $rr->add_header( 'Content-Type: text/xml;charset=utf-8' );
    $rr->set_body( $this->request_body );

    // should throw an error on failure
    $rr->execute();
    // in that case, we should never get here

    $this->result = xmlrpc_decode( $rr->get_response_body() );
  }

  public function get_result()
  {
    return $this->result;
  }
}

?>