# Pure PHP - [WebAuthn Server](https://webauthn-doc.spomky-labs.com/pure-php/webauthn-server.md) - [Input Loading](https://webauthn-doc.spomky-labs.com/pure-php/input-loading.md) - [Input Validation](https://webauthn-doc.spomky-labs.com/pure-php/input-validation.md) - [Register Authenticators](https://webauthn-doc.spomky-labs.com/pure-php/authenticator-registration.md) - [Authenticate Your Users](https://webauthn-doc.spomky-labs.com/pure-php/authenticate-your-users.md) - [Advanced Behaviors](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours.md) - [Debugging](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/debugging.md) - [User Verification](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/user-verification.md) - [Authenticator Selection Criteria](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/authenticator-selection-criteria.md) - [Authentication without username](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/authentication-without-username.md) - [Authenticator Algorithms](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/authenticator-algorithms.md) - [Attestation and Metadata Statement](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/attestation-and-metadata-statement.md) - [Extensions](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/extensions.md) - [Authenticator Counter](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/authenticator-counter.md) - [Cross Origin Authentication](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/cross-origin-authentication.md) - [Signal API](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/signal-api.md) - [Backup Events](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/backup-events.md) - [Conditional Create](https://webauthn-doc.spomky-labs.com/pure-php/advanced-behaviours/conditional-create.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://webauthn-doc.spomky-labs.com/pure-php.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.