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wordpress-4.0/ wp-admin/ options-head.php
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<?php
/**
 * WordPress Options Header.
 *
 * Displays updated message, if updated variable is part of the URL query.
 *
 * @package WordPress
 * @subpackage Administration
 */

wp_reset_vars( array( 'action' ) );

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();