经过微信开发使用到的curl提交xml数据笔记，用curl的post发送xml，接收返回的xml数据，并解析xml为数组

$url = "http://localhost/response.php";

 
$xml = '<xml><AppId>wxf8b4f85f3a794e77</AppId><ErrorType>1001</ErrorType><Description>错误描述</Description><AlarmContent>transaction_id=33534453534</AlarmContent><TimeStamp>1393860740</TimeStamp><AppSignature>f8164781a303f4d5a944a2dfc68411a8c7e4fbea</AppSignature><SignMethod>sha1</SignMethod></xml>';  
  
/**
 * 以post方式提交xml到对应的接口url
 * @param string $xml 需要post的xml数据
 * @param string $url url
 * @param bool $useCert 是否需要证书，默认不需要
 * @param int $second url执行超时时间，默认30s
 * @throws WxPayException
 */
 private function _postXmlCurl($xml, $url, $useCert = false, $second = 30)
 { 
 $ch = curl_init();
 //设置超时
 curl_setopt($ch, CURLOPT_TIMEOUT, $second);
 $header[] = "Content-type: text/xml";//定义content-type为xml 
 curl_setopt($ch, CURLOPT_HEADER, 0); //定义是否显示状态头 1：显示 ； 0：不显示 
 curl_setopt($ch, CURLOPT_HTTPHEADER, $header);//定义请求类型 
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//定义是否直接输出返回流 这里要注意，如果为0则输入结果为 true|false
 //如果有配置代理这里就设置代理
 if(WxPayConfig::CURL_PROXY_HOST != "0.0.0.0" 
 && WxPayConfig::CURL_PROXY_PORT != 0){
 curl_setopt($ch,CURLOPT_PROXY, WxPayConfig::CURL_PROXY_HOST);
 curl_setopt($ch,CURLOPT_PROXYPORT, WxPayConfig::CURL_PROXY_PORT);
 }
 curl_setopt($ch,CURLOPT_URL, $url);
 curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
 curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,FALSE);//严格校验
 if($useCert == true){
 //设置证书
 //使用证书：cert 与 key 分别属于两个.pem文件
 curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
 curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);
 curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
 curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);
 }
 //post提交方式
 curl_setopt($ch, CURLOPT_POST, TRUE);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
 //运行curl
 $data = curl_exec($ch);
 //返回结果
 if($data){
 curl_close($ch);
 libxml_disable_entity_loader(true);
 $xmsToArray = json_decode(json_encode(simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA)), true); //接收到的xml数据转换为数组
 return $xmsToArray;
 } else { 
 $error = curl_errno($ch);
 curl_close($ch);
 throw new WxPayException("curl出错，错误码:$error");
 }
 }

接收处理，比如上面请求的接口地址，http://localhost/response.php :代码如下

$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];  
 
$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);