@deron
There are several ways to approach rate limiting in PHP to prevent DDoS attacks. Here's one example:
Here's an example implementation:
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<?php // Maximum number of requests allowed per second $max_requests = 10; // Time period in seconds $time_period = 1; // Get the client's IP address $client_ip = $_SERVER['REMOTE_ADDR']; // Check if the IP address has exceeded the limit $requests = apc_fetch($client_ip); if ($requests === false) { // New IP address, create a new entry $requests = array(time()); } else { // Remove expired requests $valid_requests = array(); foreach ($requests as $request_time) { if (time() - $request_time <= $time_period) { $valid_requests[] = $request_time; } } $requests = $valid_requests; // Check if the IP address has exceeded the limit if (count($requests) >= $max_requests) { header('HTTP/1.1 429 Too Many Requests'); header('Content-Type: text/plain'); echo 'Rate limit exceeded'; exit(); } // Add the new request $requests[] = time(); } // Save the revised request list apc_store($client_ip, $requests); |
This implementation uses the APC extension to store the request times in memory. You can modify it to use a database or file system for persistence if desired. Note that this is just one of many possible approaches to rate limiting in PHP, and may need to be adjusted or combined with other techniques to fully protect against DDoS attacks.