php 发送post数据

<?php
/**
 * Curl版本
 * 使用方法：
 * $post_string = "app=request&version=beta";
 * request_by_curl('http://localhost/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, $post_string);//设置要传输的数据
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $data = curl_exec($ch);
  curl_close($ch);
 
  return $data;
}