# Pure PHP

- [Webauthn Server](/v4.0-erin-elderflower/pure-php/the-hard-way.md)
- [Register Authenticators](/v4.0-erin-elderflower/pure-php/authenticator-registration.md)
- [Authenticate Your Users](/v4.0-erin-elderflower/pure-php/authenticate-your-users.md)
- [Advanced Behaviours](/v4.0-erin-elderflower/pure-php/advanced-behaviours.md)
- [Debugging](/v4.0-erin-elderflower/pure-php/advanced-behaviours/debugging.md)
- [User Verification](/v4.0-erin-elderflower/pure-php/advanced-behaviours/user-verification.md)
- [Authenticator Selection Criteria](/v4.0-erin-elderflower/pure-php/advanced-behaviours/authenticator-selection-criteria.md)
- [Attestation and Metadata Statement](/v4.0-erin-elderflower/pure-php/advanced-behaviours/attestation-and-metadata-statement.md)
- [Authentication without username](/v4.0-erin-elderflower/pure-php/advanced-behaviours/authentication-without-username.md)
- [Extensions](/v4.0-erin-elderflower/pure-php/advanced-behaviours/extensions.md)
- [Authenticator Counter](/v4.0-erin-elderflower/pure-php/advanced-behaviours/authenticator-counter.md)
- [Dealing with “localhost”](/v4.0-erin-elderflower/pure-php/advanced-behaviours/dealing-with-localhost.md)