Phrame 3 offers a large part of the Struts functionality in a more or less similar way. Some things are different though, mostly due to the nature of PHP. And Phrame also comes with a few unique features of its own.
Click the corresponding link on the left side menu to view the Phrame 3 change log.
Read the "how to"-s listed on the left side menu to learn how to deal with the differences with Struts and how to use other unique Phrame features.