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<?php
declare(strict_types=1);
namespace Yiisoft\Cache\Metadata;
use Yiisoft\Cache\Exception\InvalidArgumentException;
use function ceil;
use function log;
use function microtime;
use function random_int;
use function sprintf;
use function time;
use const PHP_INT_MAX;
final class CacheItem
{
private ?int $expiry;
private float $created;
public function __construct(?int $expiry)
$this->expiry = $expiry;
$this->created = microtime(true);
}
public function expiry(?int $expiry): void
public function expired(float $beta): bool
if ($beta < 0) {
throw new InvalidArgumentException(sprintf(
'Argument "$beta" must be a positive number, %f given.',
$beta
));
if ($this->expiry === null) {
return false;
if ($this->expiry <= time()) {
return true;
$now = microtime(true);
$delta = ceil(1000 * ($now - $this->created)) / 1000;
$expired = $now - $delta * $beta * log(random_int(1, PHP_INT_MAX) / PHP_INT_MAX);
return $this->expiry <= $expired;
yiisoft /
cache
