PHP script to get HTTP Request Headers

<?php

$headers = array();

echo "REMOTE_ADDR: ".$_SERVER['REMOTE_ADDR']."<br />";

foreach(array_keys($_SERVER) as $skey)

{

  if(substr($skey, 0, 5) == "HTTP_")

  {

    if ($skey != "HTTP_COOKIE")

    {

      echo $skey.": ".$_SERVER[$skey]."<br />";

    }

  }

}

?>