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'];
}