webform_salesforce.module

<?php
/**
 * Implements hook_webform_submission_presave().
 */
function webform_salesforce_webform_submission_presave($node, &$submission) {
  switch ($node->nid) {
    case YOUR_NID: // the node ID of your Webform

      $sfid = 'YOUR_SALESFORCE_ID'; // Your Salesforce ID

      // Bundle the request and send it to Salesforce.com
      // Edit the below and enter the CID values for each field
      $req .= '&first_name=' . urlencode($submission->data[FIELD_CID]['value'][0]);
      $req .= '&last_name=' . urlencode($submission->data[FIELD_CID]['value'][0]);
      $req .= '&title=' . urlencode($submission->data[FIELD_CID]['value'][0]);
      $req .= '&company=' . urlencode($submission->data[FIELD_CID]['value'][0]);
      $req .= '&email=' . urlencode($submission->data[FIELD_CID]['value'][0]);
      $req .= '&city=' . urlencode($submission->data[FIELD_CID]['value'][0]);
      $req .= '&debug=' . urlencode('0'); // change to 1 for debug mode
      $req .= '&oid=' . urlencode($sfid);
      $req .= '&retURL=' . urlencode('http://www.example.com');
      // $req .= '&debugEmail=' . urlencode('example@example.com');

      $header  = 'POST /servlet/servlet.WebToLead?encoding=UTF-8 HTTP/1.0\r\n';
      $header .= 'Content-Type: application/x-www-form-urlencoded\r\n';
      $header .= 'Host: www.salesforce.com\r\n';
      $header .= 'Content-Length: ' . drupal_strlen($req) . '\r\n\r\n';
      $fp = fsockopen('www.salesforce.com', 80, $errno, $errstr, 30);
      if (!$fp) {
        echo 'No connection made';
      }
      else {
        fwrite($fp, $header . $req);
        while (!feof($fp)) {
          $res = fgets($fp, 1024);
          echo $res;
        }
      }
      fclose($fp);
      break;
  }
}