<?php

/**

* Handles paginated results from web forms with rate limiting.

*

* @param array $data The array of data to paginate.

* @param int $pageSize The number of results per page.

* @param int $page The current page number.

* @param int $rateLimit The maximum number of requests allowed per time period (in seconds).

* @param int $timePeriod The time period for rate limiting (in seconds).

* @return array|false An array containing the paginated data, total pages, and message, or false on error.

*/

function paginateWithRateLimit(array $data, int $pageSize, int $page, int $rateLimit, int $timePeriod): array|false

{

// Rate limiting implementation

$ip = $_SERVER['REMOTE_ADDR'];

$rateLimitKey = "rate_limit_" . $ip;

if (!isset($_SESSION[$rateLimitKey])) {

$_SESSION[$rateLimitKey] = [];

}

$startTime = time();

$requests = array_count_values($_SESSION[$rateLimitKey]);

// Clean up old requests

foreach ($requests as $key => $timestamp) {

if ($startTime - $timestamp > $timePeriod) {

unset($_SESSION[$rateLimitKey][$key]);

}

}

if (count($_SESSION[$rateLimitKey]) >= $rateLimit) {

return ['message' => 'Rate limit exceeded. Please try again later.', 'data' => []];

}

// Add current request

$_SESSION[$rateLimitKey][] = time();

$start = ($page - 1) * $pageSize;

$end = $start + $pageSize;

if ($start < count($data)) {

$result = array_slice($data, $start, $pageSize);

$totalResults = count($data);

$totalPages = ceil($totalResults / $pageSize);

return [

'data' => $result,

'totalResults' => $totalResults,

'totalPages' => $totalPages,

'currentPage' => $page,

'pageSize' => $pageSize,

'message' => '', // No message on success

];

} else {

return ['message' => 'No more results.', 'data' => []];

}

}

//Example Usage (for testing)

/*

$data = range(1, 100);

$pageSize = 10;

$page = 1;

$rateLimit = 5;

$timePeriod = 60; // seconds

$result = paginateWithRateLimit($data, $pageSize, $page, $rateLimit, $timePeriod);

if ($result) {

echo "<pre>";

print_r($result);

echo "</pre>";

} else {

echo "Error during pagination.";

}

*/

?>