How to use registration_errors filter in WordPress

Example 1: Adding a Custom Error

Here’s how you can add a demo error during registration. This example shows you how to modify the $errors object.

    function weplugins_check_fields( $errors, $sanitized_user_login, $user_email ) {
        $errors->add( 'demo_error', __( '<strong>ERROR</strong>: This is a demo error.', 'my_textdomain' ) );
        return $errors;
    }
    add_filter( 'registration_errors', 'weplugins_check_fields', 10, 3 );
    

Example 2: Modifying Errors Based on Conditions

In this example, you can see how to update the $errors object according to your website requirements. This can be conditional based on your needs.

    function weplugins_modify_registration_errors_defaults($errors, $sanitized_user_login, $user_email) {
        // Update the $errors variable according to your website requirements.
        return $errors; 
    }
    add_filter( "registration_errors", "weplugins_modify_registration_errors_defaults", 10, 3 );
    

Example 3: Removing the Hook

Sometimes, you need to remove a hook. Use remove_filter to remove the registration_errors filter. Make sure you provide the same callback function name, priority, and number of arguments.

    remove_filter( "registration_errors", "weplugins_modify_registration_errors_defaults", 10, 3 );
    

Parameters: This hook requires three parameters: $errors (WP_Error), $sanitized_user_login (string), and $user_email (string).