Describe the role of Zend_Auth and its components.

Describe the role of Zend_Auth and its components.

Answer: `Zend_Auth` is a component of the Zend Framework that handles user authentication. Its primary role is to provide a way to authenticate users against various backends (like databases, LDAP, etc.) and maintain authentication states within a session.

Key Components of `Zend_Auth`:

1. Adapter: The authentication adapter (`Zend_Auth_Adapter`) is responsible for verifying the user’s credentials. It can be customized to use different sources for user data, such as databases or web services.

2. Auth Storage: (`Zend_Auth_Storage`) handles the storage of authenticated user data, typically using sessions or other storage mechanisms to persist user information across requests.

3. Authentication: The main class (`Zend_Auth`) facilitates the authentication process, invoking the adapter to check credentials and manage user sessions.

Overall, `Zend_Auth` provides a flexible framework for managing user authentication in web applications.

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