can::ParseOptions

protected function ParseOptions ($arOptions, $arParseParams)
{
	if ( ! is_array($arOptions) )
		throw new Exception();

	$arParsedOptions = array();

	foreach ($arParseParams as $paramName => $arParamData)
	{
		// If option cannot be omitted - check it
		if ($arParamData['mandatory'])
		{
			if ( ! array_key_exists($paramName, $arOptions) )
				throw new Exception();
		}
		else	// option can be omitted, so can be default value
		{
			if ( ! array_key_exists($paramName, $arOptions) )
			{
				if (array_key_exists('default_value', $arParamData))
					$arOptions[$paramName] = $arParamData['default_value'];
			}
		}

		// now, check and cast (if should) type of value in $arOptions[$paramName]
		switch ($arParamData['type'])
		{
			case 'boolean':
				if ( ! in_array($arOptions[$paramName], array(true, false), true) )
					throw new Exception();
			break;

			case 'string':
				if ( ! is_string($arOptions[$paramName]) )
					throw new Exception();
			break;

			case 'integer':
				if ( ! is_int($arOptions[$paramName]) )
					throw new Exception();
			break;

			case 'strictly_castable_to_integer':
				if ( ! is_numeric($arOptions[$paramName]) )
					throw new Exception();

				if ( ! is_int($arOptions[$paramName] + 0) )
					throw new Exception();

				$arOptions[$paramName] = (int) ($arOptions[$paramName] + 0);
			break;

			default:
				throw new Exception();
			break;
		}

		$arParsedOptions[$paramName] = $arOptions[$paramName];
		unset ($arOptions[$paramName]);
	}

	// Ensure that there is no more options
	if (count($arOptions) > 0)
		throw new Exception('there is unprocessed options');

	return ($arParsedOptions);
}