怎么用PHP发送HTTP请求（转载）

本文转自：http://blog.snsgou.com/blog/161.html 

file_get_contents版本：

 /**
  * 发送post请求
  * @param string $url 请求地址
  * @param array $post_data post键值对数据
  * @return string
  */
 function send_post($url, $post_data) {

     $postdata = http_build_query($post_data);
     $options = array(
         'http' =>; array(
             'method' =>; 'POST',
             'header' =>; 'Content-type:application/x-www-form-urlencoded',
             'content' =>; $postdata,
             'timeout' =>; 15 * 60 // 超时时间（单位:s）
         )
     );
     $context = stream_context_create($options);
     $result = file_get_contents($url, false, $context);

     return $result;
 }

使用如下：

 post_data = array(
     'username' => 'stclair2201',
     'password' => 'handan'
 );
 send_post('http://blog.snsgou.com', $post_data);

实战经验：

当我利用上述代码给另一台服务器发送http请求时，发现，如果服务器处理请求时间过长，本地的PHP会中断请求，即所谓的超时中断，第一个怀疑的是PHP本身执行时间的超过限制，但想想也不应该，因为老早就按照这篇文章设置了“PHP执行时间限制”（【推荐】PHP上传文件大小限制大全 ），仔细琢磨，想想，应该是http请求本身的一个时间限制，于是乎，就想到了怎么给http请求时间限制搞大一点。。。。。。查看PHP手册，果真有个参数 “ timeout ”，默认不知道多大，当把它的值设大一点，问题得已解决，弱弱地做个笔记~~~

Socket版本:

 /**
  * Socket版本
  * 使用方法：
  * $post_string = "app=socket&version=beta";
  * request_by_socket('blog.snsgou.com', '/restServer.php', $post_string);
  */
 function request_by_socket($remote_server,$remote_path,$post_string,$port = 80,$timeout = 30) {
     $socket = fsockopen($remote_server, $port, $errno, $errstr, $timeout);
     if (!$socket) die("$errstr($errno)");
     fwrite($socket, "POST $remote_path HTTP/1.0");
     fwrite($socket, "User-Agent: Socket Example");
     fwrite($socket, "HOST: $remote_server");
     fwrite($socket, "Content-type: application/x-www-form-urlencoded");
     fwrite($socket, "Content-length: " . （strlen($post_string) + 8） . "");
     fwrite($socket, "Accept:*/*");
     fwrite($socket, "");
     fwrite($socket, "mypost=$post_string");
     fwrite($socket, "");
     $header = "";
     while ($str = trim(fgets($socket, 4096))) {
         $header .= $str;
     }

     $data = "";
     while (!feof($socket)) {
         $data .= fgets($socket, 4096);
     }

     return $data;
 }

Curl版本:

 /**
  * Curl版本
  * 使用方法：
  * $post_string = "app=request&version=beta";
  * request_by_curl('http://blog.snsgou.com/restServer.php', $post_string);
  */
 function request_by_curl($remote_server, $post_string) {
     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, $remote_server);
     curl_setopt($ch, CURLOPT_POSTFIELDS, 'mypost=' . $post_string);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
     curl_setopt($ch, CURLOPT_USERAGENT, "snsgou.com's CURL Example beta");
     $data = curl_exec($ch);
     curl_close($ch);

     return $data;
 }

Curl版本(2)

 /**
  * 发送HTTP请求
  *
  * @param string $url 请求地址
  * @param string $method 请求方式 GET/POST
  * @param string $refererUrl 请求来源地址
  * @param array $data 发送数据
  * @param string $contentType
  * @param string $timeout
  * @param string $proxy
  * @return boolean
  */
 function send_request($url, $data, $refererUrl = '', $method = 'GET', $contentType = 'application/json', $timeout = 30, $proxy = false) {
     $ch = null;
     if('POST' === strtoupper($method)) {
         $ch = curl_init($url);
         curl_setopt($ch, CURLOPT_POST, 1);
         curl_setopt($ch, CURLOPT_HEADER,0 );
         curl_setopt($ch, CURLOPT_FRESH_CONNECT, 1);
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
         curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
         if ($refererUrl) {
             curl_setopt($ch, CURLOPT_REFERER, $refererUrl);
         }
         if($contentType) {
             curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:'.$contentType));
         }
         if(is_string($data)){
             curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
         } else {
             curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
         }
     } else if('GET' === strtoupper($method)) {
         if(is_string($data)) {
             $real_url = $url. (strpos($url, '?') === false ? '?' : ''). $data;
         } else {
             $real_url = $url. (strpos($url, '?') === false ? '?' : ''). http_build_query($data);
         }

         $ch = curl_init($real_url);
         curl_setopt($ch, CURLOPT_HEADER, 0);
         curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:'.$contentType));
         curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
         if ($refererUrl) {
             curl_setopt($ch, CURLOPT_REFERER, $refererUrl);
         }
     } else {
         $args = func_get_args();
         return false;
     }

     if($proxy) {
         curl_setopt($ch, CURLOPT_PROXY, $proxy);
     }
     $ret = curl_exec($ch);
     $info = curl_getinfo($ch);
     $contents = array(
             'httpInfo' => array(
                     'send' => $data,
                     'url' => $url,
                     'ret' => $ret,
                     'http' => $info,
             )
     );

     curl_close($ch);
     return $ret;
 }

调用 WCF接口 的一个例子：$json = restRequest($r_url,'POST', json_encode($data));