Hi @trankhoaitayto012, welcome to the Auth0 Community!
Thanks for offering your assistance! The link redirects you to a Symfony/PHP code sample page. This page provides instructions to set up RBAC in Auth0, clone a GitHub repository that implements RBAC and run the API Symfony server.
If you want to take a look at the code implementation, please visit the basic-role-based-access-control branch on the code sample repository. We appreciate any feedback you may have.
Thanks.