<?php
class xml  {
    var $parser;

    function xml()
    {
        $this->parser = xml_parser_create();

        xml_set_object($this->parser, &$this);
        xml_set_element_handler($this->parser, "tag_open", "tag_close");
        xml_set_character_data_handler($this->parser, "cdata");
    }

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

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

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

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

} // конец class xml

$xml_parser = new xml();
$xml_parser->parse("<A ID='hallo'>PHP</A>");
?>