The registration_errors filter hook filters the errors encountered when a new user is being registered.
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 returned, but may or may not contain errors.
If any errors are present in $errors, this will abort the user's registration.
This filter can be used to create custom validation rules on user registration. This fires when the form is submitted but before user information is saved to the database.
When used with other hooks, this filter can be used to create custom registration processes.
This example shows how to return an error.
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 );
Assuming you wanted to validate a postal code field that you have already created using the register_form hook, you might validate the field like so:
function myplugin_check_fields( $errors, $sanitized_user_login, $user_email ) {
if ( ! preg_match('/[0-9]{5}/', $_POST['zipcode'] ) ) {
$errors->add( 'zipcode_error', __( '<strong>ERROR</strong>: Invalid Zip.', 'my_textdomain' ) );
}
return $errors;
}
add_filter( 'registration_errors', 'myplugin_check_fields', 10, 3 );
The form will not create a new user if any errors are returned. Notice: The function must return the variable $errors in any case (even when there is no error in your logic), otherwise the function may cause this problem: Fatal error: Call to a member function get_error_code() on a non-object.
Since: Version 2.1
The registration_errors hook is located in wp-includes/user.php
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