main.php

<?php
require('../class/ratelimiter.php');
$rateLimiter = new RateLimiter(new Memcached(), $_SERVER["REMOTE_ADDR"],"registration");
try {
    // allow a maximum of 100 requests for the IP in 5 minutes
    $rateLimiter->limitRequestsInMinutes(1, 1);
} catch (RateExceededException $e) {
    header("HTTP/1.0 529 Too Many Requests");
    exit;
}