MatthiasMullie\Scrapbook\Adapters\Apc::set PHP Method

    public function set($key, $value, $expire = 0)
    {
        $ttl = $this->ttl($expire);
        // negative TTLs don't always seem to properly treat the key as deleted
        if ($ttl < 0) {
            $this->delete($key);
            return true;
        }
        // lock required for CAS
        if (!$this->lock($key)) {
            return false;
        }
        $success = $this->apcu_store($key, $value, $ttl);
        $this->expire($key, $ttl);
        $this->unlock($key);
        return $success;
    }