使用PHP 5.0 轻松解析XML文档（2）

<?php
/**
 *=========================================================
 *
 * @author     hahawen(大龄青年)
 * @since      2004-12-04
 * @copyright  Copyright (c) 2004, NxCoder Group
 *
 *=========================================================
 */
/**
 * class SimpleDocumentParser
 * use SAX parse xml file, and build SimpleDocumentObject
 * all this pachage&#39;s is work for xml file, and method is action as DOM.
 *
 * @package SmartWeb.common.xml
 * @version 1.0
 */
class SimpleDocumentParser {
    private $domRootObject = null;
    private $currentNO = null;
    private $currentName = null;
    private $currentValue = null;
    private $currentAttribute = null;
    public function getSimpleDocument() {
        return $this->domRootObject;
    }
    public function parse($file) {
        $xmlParser = xml_parser_create();
        xml_parser_set_option($xmlParser, XML_OPTION_CASE_FOLDING, 0);
        xml_parser_set_option($xmlParser, XML_OPTION_SKIP_WHITE, 1);
        xml_parser_set_option($xmlParser, XML_OPTION_TARGET_ENCODING, &#39;UTF-8&#39;);
        xml_set_object($xmlParser, $this);
        xml_set_element_handler($xmlParser, "startElement", "endElement");
        xml_set_character_data_handler($xmlParser, "characterData");
        if (!xml_parse($xmlParser, file_get_contents($file))) die(sprintf("XML error: %s at line %d", xml_error_string(xml_get_error_code($xmlParser)) , 　　　　　　　　xml_get_current_line_number($xmlParser)));
        xml_parser_free($xmlParser);
    }
    private function startElement($parser, $name, $attrs) {
        $this->currentName = $name;
        $this->currentAttribute = $attrs;
        if ($this->currentNO == null) {
            $this->domRootObject = new SimpleDocumentRoot($name);
            $this->currentNO = $this->domRootObject;
        } else {
            $this->currentNO = $this->currentNO->createNode($name, $attrs);
        }
    }
    private function endElement($parser, $name) {
        if ($this->currentName == $name) {
            $tag = $this->currentNO->getSeq();
            $this->currentNO = $this->currentNO->getPNodeObject();
            if ($this->currentAttribute != null && sizeof($this->currentAttribute) > 0) $this->currentNO->setValue($name, array(
                &#39;value&#39; => $this->currentValue,
                　　　　　　　&#39;attrs&#39; => $this->currentAttribute
            ));
            else $this->currentNO->setValue($name, $this->currentValue);
            $this->currentNO->removeNode($tag);
        } else {
            $this->currentNO = (is_a($this->currentNO, &#39;SimpleDocumentRoot&#39;)) ? null : 　　　　　　　　 $this->currentNO->getPNodeObject();
        }
    }
    private function characterData($parser, $data) {
        $this->currentValue = iconv(&#39;UTF-8&#39;, &#39;GB2312&#39;, $data);
    }
    function __destruct() {
        unset($this->domRootObject);
    }
}
?>