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The registration_errors filter hook is 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.
The form will not create a new user if any errors are returned.
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. Registration halted.','mydomain') );
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('/\d{5}/', $_POST['user_extra']) )
$errors->add( 'zipcode_error', __('<strong>ERROR</strong>: Enter a valid 5-digit postal code.','mydomain') );
return $errors;
}
add_filter('registration_errors', 'myplugin_check_fields', 10, 3);
The registration_errors hook is located in wp-login.php
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