CWizardBase::__UnSetComplexVar

function __UnSetComplexVar($varName, &$arVars)
{
	$tokens = explode("[", str_replace("]", "", $varName));
	$arValues =& $arVars;
	do
	{
		$token = array_shift($tokens);
		if (!isset($arValues[$token]))
			return null;
		$arValues =& $arValues[$token];
	} while (count($tokens) > 1);
	unset($arValues[array_pop($tokens)]);
}