Nette\Caching\Cache::bulkLoad PHP Метод

    public function bulkLoad(array $keys, $fallback = NULL)
    {
        if (count($keys) === 0) {
            return [];
        }
        foreach ($keys as $key) {
            if (!is_scalar($key)) {
                throw new Nette\InvalidArgumentException('Only scalar keys are allowed in bulkLoad()');
            }
        }
        $storageKeys = array_map([$this, 'generateKey'], $keys);
        if (!$this->storage instanceof IBulkReader) {
            $result = array_combine($keys, array_map([$this->storage, 'read'], $storageKeys));
            if ($fallback !== NULL) {
                foreach ($result as $key => $value) {
                    if ($value === NULL) {
                        $result[$key] = $this->save($key, function (&$dependencies) use($key, $fallback) {
                            return call_user_func_array($fallback, [$key, &$dependencies]);
                        });
                    }
                }
            }
            return $result;
        }
        $cacheData = $this->storage->bulkRead($storageKeys);
        $result = [];
        foreach ($keys as $i => $key) {
            $storageKey = $storageKeys[$i];
            if (isset($cacheData[$storageKey])) {
                $result[$key] = $cacheData[$storageKey];
            } elseif ($fallback) {
                $result[$key] = $this->save($key, function (&$dependencies) use($key, $fallback) {
                    return call_user_func_array($fallback, [$key, &$dependencies]);
                });
            } else {
                $result[$key] = NULL;
            }
        }
        return $result;
    }