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<?php
declare(strict_types=1);
/*
* This file is part of Bounded Cache.
*
* (c) Graham Campbell <hello@gjcampbell.co.uk>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace GrahamCampbell\BoundedCache;
use DateInterval;
use DateTimeImmutable;
/**
* This is TTL helper.
*
* @author Graham Campbell <hello@gjcampbell.co.uk>
*/
final class TtlHelper
{
/**
* Computes the correct TTL to use.
*/
public static function computeTtl(int $min, int $max, null|int|\DateInterval $ttl = null)
{
if ($ttl instanceof DateInterval) {
$ttl = self::dateIntervalToSeconds($ttl);
}
return max($min, min($ttl ?: $min, $max));
}
/**
* Convert a date interval to seconds.
*/
private static function dateIntervalToSeconds(DateInterval $ttl): int
{
$reference = (new DateTimeImmutable())->setTimestamp(0);
return $reference->add($ttl)->getTimestamp();
}
}