Something

function SELECT( $select, $where, $is, $from )
{

	for( get_xml_files_and_loop )
	{
		$xml = simplexml_load_file( xml_file );

		if( $xml->$where = $is )
			return $xml->$select;
	}

	return 0;

}



usage:


SELECT( $->money, $->name, "hobbes", "xml_files/" );