CKFinder 3 can also be installed as a Symfony bundle.
The Symfony 3 Bundle source code along with documentation and usage examples is available in a dedicated GitHub repository: https://github.com/ckfinder/ckfinder-symfony3-bundle.
For Symfony 2, please have a look at: https://github.com/ckfinder/ckfinder-symfony2-bundle.
Please use the GitHub Issues page to report issues and submit feature requests for the CKFinder 3 Bundle for Symfony 2.