protected function prepareCache($cache)
{
$num = (int) $cache;
$time = substr($cache, strpos($cache, ' '));
switch ($time) {
case 'day':
case 'days':
return (int) $num * 60 * 60 * 24;
case 'hour':
case 'hours':
return (int) $num * 60 * 60;
case 'min':
default:
return (int) $num * 60;
}
}