Base::getFilterValue

public function getFilterValue($key, $defaultValue = null, $acceptedListModificators = '<>!=')
{
	if (isset($this->filter[$key]))
	{
		return $this->filter[$key];
	}

	$filter = $this->getFilter();
	foreach ($filter as $k => $value)
	{
		$k0 = trim($k, $acceptedListModificators);
		if ($k0 == $key)
		{
			return $value;
		}
	}

	return $defaultValue;
}