PHP xml_set_object() Fonction

<?php
class XMLParser
{
private $parser;

function __construct() {
$this->parser = xml_parser_create();
xml_set_object($this->parser, $this);
xml_set_element_handler($this->parser, "start_tag", "end_tag");
xml_set_character_data_handler($this->parser, "cdata");
}

function __destruct() {
xml_parser_free($this->parser);
unset($this->parser);
}

function parse($data) {
xml_parse($this->parser, $data);
}

function start_tag($parser, $tag, $attributes) {
var_dump($tag, $attributes);
}

function cdata($parser, $cdata) {
var_dump($cdata);
}

function end_tag($parser, $tag) {
var_dump($tag);
}
}

$xml_parser = new XMLParser();
$xml_parser->parse("<p id='test'>Hello World!</p>");
?>