# Debugging

If you have troubles during the development of your application or if you want to keep track of every critical/error messages in production, you can use a [PSR-3 compatible logger](https://www.php-fig.org/psr/psr-3/).

Several classes implement the interface `Webauthn\MetadataService\CanLogData`. This interface allows setting a PSR-3 logger instance.


---

# 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/v4.5/pure-php/advanced-behaviours/debugging.md?ask=<question>
```

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.