php发送post请求的三种方法

引用：http://blog.sjzycxx.cn/post/435/

1.使用 file_get_contents()

/**
* 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;
}

//使用方法，需要2个参数，URL和参数，post的参数得自己构造，是数组的格式
$post_data = array(
      'username' => 'stclair2201',
      'password' => 'handan'
);
send_post('http://www.qianyunlai.com', $post_data);

2.Socket版本

<?php
/**
* Socket版本
* 使用方法：
* $post_string = "app=socket&version=beta";
* request_by_socket('chajia8.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;
}
?>

3.Curl版本

<?php
/**
* Curl版本
* 使用方法：
* $post_string = "app=request&version=beta";
* request_by_curl('http://www.qianyunlai.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, "qianyunlai.com's CURL Example beta");
     $data = curl_exec($ch);
     curl_close($ch);

return $data;
}
?>