Are there any best practices or recommended techniques for implementing flood control and managing excessive requests in PHP?

To implement flood control and manage excessive requests in PHP, one recommended technique is to use a token-based approach where a unique token is generated for each request and stored in a session or database. This token can then be validated to ensure that only a certain number of requests are allowed within a specific time frame. 

session_start();

$token = md5(uniqid(mt_rand(), true));

if(!isset($_SESSION['tokens'])) {
    $_SESSION['tokens'] = [];
}

// Add current token to session tokens
$_SESSION['tokens'][] = $token;

// Remove old tokens
$timeLimit = time() - 60; // 60 seconds
$_SESSION['tokens'] = array_filter($_SESSION['tokens'], function($t) use ($timeLimit) {
    return $t > $timeLimit;
});

if(count($_SESSION['tokens']) > 10) {
    // Flood control - limit to 10 requests per minute
    http_response_code(429); // Too Many Requests
    exit();
}

// Process the request

Keywords

rate limiting throttle requests PHP security excessive requests

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