How can the format of the DSN string affect the functionality of Pear Auth_HTTP when connecting to a database?

The format of the DSN string can affect the functionality of Pear Auth_HTTP when connecting to a database if it is not correctly configured. To solve this issue, ensure that the DSN string includes the correct database type (e.g., mysql), host, database name, and any necessary credentials. Additionally, make sure that the DSN string is properly formatted according to the requirements of the database driver being used.

$dsn = 'mysql://username:password@localhost/database_name';