php สามารถส่งตัวแปรไป submit หน้าอื่นได้ไหมครับ แล้วจะสั่งให้มันกด submit ยังไงครับ

function do_post_request($url, $postdata)
{
  $content = "";

  // Add post data to request.
  foreach($postdata as $key => $value)
  {
    $content .= "{$key}={$value}&";
  }

  $params = array('http' => array(
    'method' => 'POST',
    'header' => 'Content-Type: application/x-www-form-urlencoded',
    'content' => $content
  ));

  $ctx = stream_context_create($params);
  $fp = fopen($url, 'rb', false, $ctx);

  if (!$fp) {
    throw new Exception("Connection problem, {$php_errormsg}");
  }

  $response = @stream_get_contents($fp);
  if ($response === false) {
    throw new Exception("Response error, {$php_errormsg}");
  }

  return $response;
}

$address = array(
  'http://xxx.xxx.xxx.xxx/submitForm',
  'http://xxx.xxx.xxx.xxy/submitForm',
  'http://xxx.xxx.xxx.xxz/submitForm'
);

// Post variables.
$postdata = array(
  'username' => 'value1',
  'password' => 'value2',
  'param3' => 'value3'
);

foreach($address AS $value) do_post_request($value, $postdata);