Why Am I Getting a 'Authentication Method Mismatch' Error When Connecting PHP to MySQL 8.0 ?

PHP with MySQL 8.0 Error: Authentication Method Mismatch

When connecting to a MySQL database from PHP, users may encounter the error "SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client." This issue arises due to a mismatch between the authentication method used by MySQL and the method expected by the client application.

Cause:

MySQL 8.0 introduced a default authentication plugin called caching_sha2_password, which is not natively supported by older PHP versions or some client applications. By default, applications expect to authenticate using a password-based method, while MySQL 8.0 requires the use of the caching_sha2_password plugin.

Solution:

To resolve the error, you need to modify the authentication method used by MySQL to match the method expected by your application. Follow these steps:

1. Log in to MySQL as the root user.
2. Execute the following command to change the authentication method for the root user to mysql_native_password:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

Replace 'password' with the root password.

3. If your application uses a different user to connect to the database, replace 'root' in the above command with the appropriate user.
4. Restart the MySQL service for the changes to take effect.

Additional Notes:

• Ensure that your PHP version supports the caching_sha2_password method. If not, update PHP to a compatible version.
• Refer to the MySQL documentation for more information on authentication methods and plugins.
• If the issue persists after changing the authentication method, ensure that the user has the necessary permissions to access the database.

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