MatthiasMullie\Scrapbook\Adapters\Apc::touch PHP Метод

    public function touch($key, $expire)
    {
        $ttl = $this->ttl($expire);
        // shortcut - expiring is similar to deleting, but the former has no
        // 1-operation equivalent
        if ($ttl < 0) {
            return $this->delete($key);
        }
        // get existing TTL & quit early if it's that one already
        $iterator = $this->APCuIterator('/^' . preg_quote($key, '/') . '$/', \APC_ITER_VALUE | \APC_ITER_TTL, 1, \APC_LIST_ACTIVE);
        $current = $iterator->current();
        if (!$current) {
            // doesn't exist
            return false;
        }
        if ($current['ttl'] === $ttl) {
            // that's the TTL already, no need to reset it
            return true;
        }
        // generate CAS token to safely CAS existing value with new TTL
        $value = $current['value'];
        $token = serialize($value);
        return $this->cas($token, $key, $value, $ttl);
    }