_upgrade_cron_array( array $cron )

function _upgrade_cron_array($cron) {
	if ( isset($cron['version']) && 2 == $cron['version'])
		return $cron;

	$new_cron = array();

	foreach ( (array) $cron as $timestamp => $hooks) {
		foreach ( (array) $hooks as $hook => $args ) {
			$key = md5(serialize($args['args']));
			$new_cron[$timestamp][$hook][$key] = $args;
		}
	}

	$new_cron['version'] = 2;
	update_option( 'cron', $new_cron );
	return $new_cron;
}