PHP - Apache Request Headers Helper

request_headers_helper.php

<?php

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