Yes, you can. This is available via the Manage Hosting > Select Package > PHP Configuration section of our control panel. Alternatively, you can create a custom file in your webspace with your desired PHP configuration. Please note that PHP will only read a custom configuration once every 5 minutes, so it can take a short time before the configuration changes appear on your website. This is always the case for our WordPress platform, as PHP-FPM caches the configuration quite aggresively.