It supports some of SAML 2.0 data models: AuthnRequest, and Response, and HTTP POST and Redirect bindings, thus providing basic means for Single SignOn. It’s been tested with sample XML messages obtained through communication of SimpleSAML with ADFS, that all are available in the resources/sample directory.
The library does not include nor implement any SAML profile. At the moment, profiles are out of the scope of the library and up to the users to implement.
This PHP library is open source and released under MIT license, and for the details you can look at the included LICENSE file.