/*
** The function:
*/

function PostRequest($url, $referer, $_data) {

    // convert variables array to string:
    $data = array();
    while(list($n,$v) = each($_data)){
        $data[] = "$n=$v";
    }
    $data = implode('&', $data);
    // format --> test1=a&test2=b etc.

    // parse the given URL
    $url = parse_url($url);
    if ($url['scheme'] != 'http') {
        die('Only HTTP request are supported !');
    }

    // extract host and path:
    $host = $url['host'];
    $path = $url['path'];

    // open a socket connection on port 80
    $fp = fsockopen($host, 80);

    // send the request headers:
    fputs($fp, "POST $path HTTP/1.1\r\n");
    fputs($fp, "Host: $host\r\n");
    fputs($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);
    }

    // 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 array:
    return array($header, $content);
}

/*
** The example:
*/

// submit these variables to the server:
$data = array(
    'test' => 'foobar',
    'okay' => 'yes',
    'number' => 2
);

// send a request to example.com (referer = jonasjohn.de)
list($header, $content) = PostRequest(
    "http://www.example.com/",
    "http://www.jonasjohn.de/",
    $data
);

// print the result of the whole request:
print $content;

// print $header; --> prints the headers