WordPress/wp-admin/options-head.php

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<?php
/**
* WordPress Options Header.
*
* Resets variables: 'action', 'standalone', and 'option_group_id'. Displays
* updated message, if updated variable is part of the URL query.
*
* @package WordPress
* @subpackage Administration
*/
wp_reset_vars(array('action', 'standalone', 'option_group_id'));
if ( isset( $_GET['updated'] ) && isset( $_GET['page'] ) ) {
// For backwards compat with plugins that don't use the Settings API and just set updated=1 in the redirect
add_settings_error('general', 'settings_updated', __('Settings saved.'), 'updated');
}
settings_errors();