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<?php
declare(strict_types=1);
namespace Yiisoft\Yii\RateLimiter\Storage;
use Yiisoft\Yii\RateLimiter\Exception\CannotUseException;
final class ApcuStorage implements StorageInterface
{
private const DEFAULT_FIX_PRECISION_RATE = 1000000;
/**
* @param int $fixPrecisionRate
* floating point is not supported by apcu_cas of ACPu, so use it to improves precision.
*/
public function __construct(
private int $fixPrecisionRate = self::DEFAULT_FIX_PRECISION_RATE
) {
if (!extension_loaded('apcu') || ini_get('apc.enabled') === '0') {
throw new CannotUseException('APCu extension is not loaded or not enabled.');
}
public function saveIfNotExists(string $key, mixed $value, int $ttl): bool
$value = (int) ($value * $this->fixPrecisionRate);
return (bool)apcu_add($key, $value, $ttl);
public function saveCompareAndSwap(string $key, mixed $oldValue, mixed $newValue, int $ttl): bool
$oldValue = (int) ($oldValue * $this->fixPrecisionRate);
$newValue = (int) ($newValue * $this->fixPrecisionRate);
return (bool)apcu_cas($key, $oldValue, $newValue);
public function get(string $key): mixed
$value = apcu_fetch($key);
if ($value != false) {
$value = floatval($value / $this->fixPrecisionRate);
return $value;
yiisoft /
rate-limiter
