<?php

if(!function_exists('apache_request_headers'))
{
    function apache_request_headers()
    {
        static $arh = array();

        if (!$arh)
        {
            $rx_http = '/\AHTTP_/';
            foreach ($_SERVER as $key => $val)
            {
                if(preg_match($rx_http, $key))
                {
                    $arh_key = preg_replace($rx_http, '', $key);
                    $rx_matches = array();

                    // do some nasty string manipulations to restore the original letter case
                    // this should work in most cases
                    $rx_matches = explode('_', $arh_key);
                    if( count($rx_matches) > 0 and strlen($arh_key) > 2 )
                    {
                        foreach($rx_matches as $ak_key => $ak_val)
                        {
                            $rx_matches[$ak_key] = ucfirst($ak_val);
                        }

                        $arh_key = implode('-', $rx_matches);
                    }

                    $arh[$arh_key] = $val;
                }
            }
        }

        return $arh;
    }
}