/**

 * 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

$post_data = array(

  'username' => 'stclair2201',

  'password' => 'handan'

);

send_post('http://www.waitalone.cn', $post_data);

<?php

/**

 * Socket版本

 * 使用方法：

 * $post_string = "app=socket&version=beta";

 * request_by_socket('waitalone.cn', '/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;

}

?>

<?php

/**

 * Curl版本

 * 使用方法：

 * $post_string = "app=request&version=beta";

 * request_by_curl('http://www.waitalone.cn/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, "waitalone.cn's CURL Example beta");

  $data = curl_exec($ch);

  curl_close($ch);  

  return $data;

}