php使用socket post数据到其它web服务器的方法

function post_request($url, $data, $referer=) {
  // Convert the data array into URL Parameters like a=b&foo=bar etc.
  $data = http_build_query($data);
  // parse the given URL
  $url = parse_url($url);
  if ($url[scheme] != http) { 
    die(Error: Only HTTP request are supported !);
  }
  // extract host and path:
  $host = $url[host];
  $path = $url[path];
  // open a socket connection on port 80 - timeout: 30 sec
  $fp = fsockopen($host, 80, $errno, $errstr, 30);
  if ($fp){
    // send the request headers:
    fputs($fp, "POST $path HTTP/1.1\r\n");
    fputs($fp, "Host: $host\r\n");
    if ($referer != )
      fputs($fp, "Referer: $referer\r\n");
    fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
    fputs($fp, "Content-length: ". strlen($data) ."\r\n");
    fputs($fp, "Connection: close\r\n\r\n");
    fputs($fp, $data);
    $result = ; 
    while(!feof($fp)) {
      // receive the results of the request
      $result .= fgets($fp, 128);
    }
  }
  else { 
    return array(
      status => err, 
      error => "$errstr ($errno)"
    );
  }
  // close the socket connection:
  fclose($fp);
  // split the result header from the content
  $result = explode("\r\n\r\n", $result, 2);
  $header = isset($result[0]) ? $result[0] : ;
  $content = isset($result[1]) ? $result[1] : ;
  // return as structured array:
  return array(
    status => ok,
    header => $header,
    content => $content
  );
}
//使用方法
// Submit those variables to the server
$post_data = array(
  test => foobar,
  okay => yes,
  number => 2
);
// Send a request to example.com 
$result = post_request(http://www.example.com/, $post_data);
if ($result[status] == ok){
  // Print headers 
  echo $result[header]; 
  echo <hr />;
  // print the result of the whole request:
  echo $result[content];
}
else {
  echo A error occured:  . $result[error]; 
}