Thank you for your request and interest in GroupDocs.
Basically, at this moment we have a Viewer plugin
for first version of the Symfony CMS. This plugin is an initial version and doesn't has our SDK. This plugin allows only to embed the iframe with the GroupDocs.Viewer (it will view document whose GUID you will put there).
But, as we understand , you want to use our PHP SDK in the Symfony2 CMS and you want to upload your documents to our service via our API method . For how to use our Viewer API please check our documentation here
. Also we have demo samples for how to use our PHP SDK in a web application here
Summarizing all these information you can independently create a functionality, that you need , via our PHP SDK and the Symfony2 API
If you will have more questions please feel free to contact us.
Your Document Collaboration APIs
Follow us on LinkedIn, Twitter, Facebook and Google+