/**
* Append new unit
* @param string $unit
* @param int $index
* @return void
*/
public function appendUnit($unit, $index)
{
foreach (self::$units as $k => $v) {
if ($index < $v) {
return Arrays::insertBefore(self::$units, $k, array($unit => $index));
}
}
self::$units[$index] = $index;
}
