What to use for XML parsing / reading in PHP4

$xml = ...; // Get your XML data
$xml_parser = xml_parser_create();

// _start_element and _end_element are two functions that determine what
// to do when opening and closing tags are found
xml_set_element_handler($xml_parser, "_start_element", "_end_element");

// How to handle each char (stripping whitespace if needs be, etc
xml_set_character_data_handler($xml_parser, "_character_data");

xml_parse($xml_parser, $xml);