wechat-curl

@@ -533,6 +533,11 @@ class WxPayApi
     private static function postXmlCurl($xml, $url, $useCert = false, $second = 30)
     {
         $ch = curl_init();
+        //设置curl默认访问为IPv4
+        if (defined('CURLOPT_IPRESOLVE') && defined('CURL_IPRESOLVE_V4')) {
+            curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
+        }
+        
         //设置超时
         curl_setopt($ch, CURLOPT_TIMEOUT, $second);
 
@@ -548,7 +553,7 @@ class WxPayApi
         curl_setopt($ch, CURLOPT_HEADER, FALSE);
         //要求结果为字符串且输出到屏幕上
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
-
+        
         if ($useCert == true) {
             //设置证书
             //使用证书：cert 与 key 分别属于两个.pem文件