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How to use registration_errors filter in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
July 12, 2022
5 minutes read

registration_errors filter

The filtered WP_Error object may, for example, contain errors for an invalid or existing username or email address. A WP_Error object should always be returned, but may or may not contain errors.

To use registration_errors filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at Flipper Code, always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_registration_errors_defaults which takes 3 parameters and we registered using add_filter. The first parameter registration_errors is name of the hook, The second parameter modify_registration_errors_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_filter to remove registration_errors filter.


    Below are the 3 parameters are required to use this hook.

  • $errors : (WP_Error) A WP_Error object containing any errors encountered during registration.
  • $sanitized_user_login : (string) User’s username after it has been sanitized.
  • $user_email : (string) User’s email.

Live Example

function myplugin_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', 'myplugin_check_fields', 10, 3 );

Below is an example how you can use this hook.

                        function modify_registration_errors_defaults($errors, $sanitized_user_login, $user_email) { 
                            // Update the $errors variable according to your website requirements and return this variable. You can modify the $errors variable conditionally too if you want.

                            return $errors; 
                        // add the filter
                        add_filter( "registration_errors", "modify_registration_errors_defaults", 10, 3 );

To remove a hook callback, use the example below.

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

Please make sure provide the same callback function name, priority and number of arguments while removing the hook callback.

Flipper Code is a Premium WordPress Plugins development company and integrating new functionalites into WordPress sites in form of custom WordPress Plugins since 2012. If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.

Sandeep Kumar Mishra

Sandeep Kumar Mishra writes about WordPress and Artificial Intelligence, offering tips and guides to help you master your website and stay updated with the latest tech trends.

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