Php Soap无法捕获变量

我在CodeIgniter上写了以下代码：

$user = get_active_user();
$userphone = $user->phone;
$usercode = $user->p_validate;

$ss = 'VALIDATION CODE:';
$msg = array();
array_push($msg, $ss, $usercode);
$last = implode(" ", $msg);

try {
  $client = new SoapClient('SOAPLINK');
  $Result = $client->smsGonder1NV2(
    array(
      'username' => 'XXXXX',
      'password' => 'XXXXX',
      'header' => 'XXXXX',
      'msg' => $last,
      'gsm' => $userphone,
      'filter' => '',
      'startdate' => '',
      'stopdate' => '',
      'encoding' => 'TR'
    )
  );
} catch (Exception $exc) {
  // Hata olusursa yakala
  echo 'Soap Hatasi Olustu: ' . $exc->getMessage();
}

Soap可以捕获消息数组，但在捕获

$userphone

时失败