nginx_request_headers.php

// apache_request_headers replicement for nginx
if (!function_exists('apache_request_headers')) { 
        function apache_request_headers() { 
            foreach($_SERVER as $key=>$value) { 
                if (substr($key,0,5)=="HTTP_") { 
                    $key=str_replace(" ","-",ucwords(strtolower(str_replace("_"," ",substr($key,5))))); 
                    $out[$key]=$value; 
                }else{
                    $out[$key]=$value; 
		}
            } 
            return $out; 
        } 
}