是那里出错了吗？连个提示都没有

function postOrder($orderXml){       

  $url="https://api.mch.weixin.qq.com/pay/unifiedorder";

$second=60;

      $ch = curl_init();

$curlVersion = curl_version();

$ua = "WXPaySDK/3.0.9(".PHP_OS.") PHP/".PHP_VERSION." CURL/".$curlVersion['version']." ".MCHID;

curl_setopt($ch, CURLOPT_TIMEOUT, $second);

curl_setopt($ch,CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_VERBOSE, 1);

curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,1);

curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);

curl_setopt($ch,CURLOPT_USERAGENT, $ua); 

curl_setopt($ch, CURLOPT_HEADER, FALSE);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

curl_setopt($ch, CURLOPT_POST, TRUE);

curl_setopt($ch, CURLOPT_POSTFIELDS, $orderXml);

$result=curl_exec($ch);

curl_close($ch);

    libxml_disable_entity_loader(true);

//先把xml转换为simplexml对象，再把simplexml对象转换成 json，再将 json 转换成数组。

$value_array = json_decode(json_encode(simplexml_load_string($result, 'SimpleXMLElement', LIBXML_NOCDATA)), true);

$return_xml = $value_array['prepay_id'];

    $this->paramters['prepay_id']=$return_xml;

    return $return_xml;

  }