Filter::set

public function set($name, $value = null)
{
	if (!array_key_exists($name, $this->values))
	{
		throw new ArgumentException("Unknown filter "$name"");
	}

	if ($value === 'all')
	{
		$value = null;
	}

	if ($name == 'period')
	{
		$this->setPeriod($value);
	}

	$this->values[$name] = $value;
}