silent_post.php

<?php
# Silent post code example for PHP

function silent_post($url, $port, $file, $var_array) {
   # Clean up some possible problems
   $url = str_replace("https://","",$url);
   $url = str_replace("http://","",$url);

   # Set the post data
   $postdata = "";
   foreach ($var_array as $key => $value) {
      $postdata .= $key . "=" . urlencode($value) . "&";
   }
   $postdata = trim((trim($postdata)), "&");

   # Make the header
   $header  = "POST $file HTTP/1.0\r\n";
   $header .= "Host: $url\r\n";
   $header .= "Connection: close\r\n";
   $header .= "Accept-Charset: UTF-8\r\n";
   $header .= "User-Agent: PHP/".phpversion()."\r\n";
   $header .= "Referer: ".$_SERVER['SERVER_SOFTWARE']."\r\n";
   $header .= "Content-Type: application/x-www-form-urlencoded\r\n";
   $header .= "Content-Length: " . strlen($postdata) . "\r\n";
   $header .= "\r\n";
   $header .= $postdata."\r\n";

   # Connect
   $fp = fsockopen ($url, $port, $errno, $errstr, 10);
   if (!$fp) {
       return NULL;
   }
   else {
       @fputs ($fp, $header);
       $file_data = '';
       while (!feof($fp)) {
           $file_data .= @fgets($fp,1024);
       }
       @fclose ($fp);
       return $file_data;
   }
}

$vars['e'] = "their@address.com";
$vars['n'] = "Their Name";
$vars['r'] = "1";
$vars['a'] = "sub";
$vars['h'] = "1";
$vars['ref'] = "co-registration from xyz.com";
silent_post('http://yoursite.com', 80, '/course/s.php', $vars);
?>