PHP XML解析类

<?php 
/* 
  +----------------------------------------------------------------------+ 
  | SofeeFramework for PHP 4                                             | 
  +----------------------------------------------------------------------+ 
  | Copyright (c) 2004-2005 Sofee Development Team.(http://www.sofee.cn) | 
  +----------------------------------------------------------------------+ 
  | This source file is subject to version 1.00 of the Sofee license,    | 
  | that is bundled with this package in the file LICENSE, and is        | 
  | available through the world-wide-web at the following url:           | 
  | http://www.sofee.cn/license/1_00.txt.                                | 
  | If you did not receive a copy of the Sofee license and are unable to | 
  | obtain it through the world-wide-web, please send a note to          | 
  | [e-mail] so we can mail you a copy immediately.              | 
  +----------------------------------------------------------------------+ 
  | Author: Justin Wu <[e-mail]>                              | 
  +----------------------------------------------------------------------+ 
*/ 
     
/* $Id: SofeeXmlParser.php,v 1.3 2005/05/30 06:30:14 wenlong Exp $ */ 

/** 
* Sofee XML Parser class - This is an XML parser based on PHP's "xml" extension. 
* 
* The SofeeXmlParser class provides a very simple and easily usable toolset to convert XML  
* to an array that can be processed with array iterators. 
* 
* @package        SofeeFramework 
* @access        public 
* @version        $Revision: 1.1 $ 
* @author        Justin Wu <[e-mail]> 
* @homepage        http://www.sofee.cn 
* @copyright    Copyright (c) 2004-2005 Sofee Development Team.(http://www.sofee.cn) 
* @since        2005-05-30 
* @see            PEAR:XML_Parser | SimpleXML extension 
*/ 
class SofeeXmlParser { 
     
    /** 
    * XML parser handle 
    * 
    * @var        resource 
    * @see        xml_parser_create() 
    */ 
    var $parser; 

    /** 
    * source encoding 
    * 
    * @var        string 
    */ 
    var $srcenc; 

    /** 
    * target encoding 
    * 
    * @var        string 
    */ 
    var $dstenc; 

    /** 
    * the original struct 
    * 
    * @access    private 
    * @var        array 
    */ 
    var $_struct = array(); 

    /** 
    * Constructor 
    * 
    * @access        public 
    * @param        mixed        [$srcenc] source encoding 
    * @param        mixed        [$dstenc] target encoding 
    * @return        void 
    * @since         
    */ 
    function SofeeXmlParser($srcenc = null, $dstenc = null) { 
        $this->srcenc = $srcenc; 
        $this->dstenc = $dstenc; 
         
        // initialize the variable. 
        $this->parser = null; 
        $this->_struct = array(); 
    } 

    /** 
    * Free the resources 
    * 
    * @access        public 
    * @return        void 
    **/ 
    function free() { 
        if (isset($this->parser) && is_resource($this->parser)) { 
            xml_parser_free($this->parser); 
            unset($this->parser); 
        } 
    } 

    /** 
    * Parses the XML file 
    * 
    * @access        public 
    * @param        string        [$file] the XML file name 
    * @return        void 
    * @since         
    */ 
    function parseFile($file) { 
        $data = @file_get_contents($file) or die("Can't open file $file for reading!"); 
        $this->parseString($data); 
    } 

    /** 
    * Parses a string. 
    * 
    * @access        public 
    * @param        string        [$data] XML data 
    * @return        void 
    */ 
    function parseString($data) { 
        if ($this->srcenc === null) { 
            $this->parser = @xml_parser_create() or die('Unable to create XML parser resource.'); 
        } else { 
            $this->parser = @xml_parser_create($this->srcenc) or die('Unable to create XML parser resource with '. $this->srcenc .' encoding.'); 
        } 
         
        if ($this->dstenc !== null) { 
            @xml_parser_set_option($this->parser, XML_OPTION_TARGET_ENCODING, $this->dstenc) or die('Invalid target encoding'); 
        } 
        xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, 0);    // lowercase tags 
        xml_parser_set_option($this->parser, XML_OPTION_SKIP_WHITE, 1);        // skip empty tags 
        if (!xml_parse_into_struct($this->parser, $data, &$this->_struct)) { 
            printf("XML error: %s at line %d",  
                    xml_error_string(xml_get_error_code($this->parser)),  
                    xml_get_current_line_number($this->parser) 
            ); 
            $this->free(); 
            exit(); 
        } 
         
        $this->_count = count($this->_struct); 
        $this->free(); 
    } 

    /** 
    * return the data struction 
    * 
    * @access        public 
    * @return        array 
    */ 
    function getTree() { 
        $i = 0; 
        $tree = array(); 

        $tree = $this->addNode( 
            $tree,  
            $this->_struct[$i]['tag'],  
            (isset($this->_struct[$i]['value'])) ? $this->_struct[$i]['value'] : '',  
            (isset($this->_struct[$i]['attributes'])) ? $this->_struct[$i]['attributes'] : '',  
            $this->getChild($i) 
        ); 

        unset($this->_struct); 
        return ($tree); 
    } 

    /** 
    * recursion the children node data 
    * 
    * @access        public 
    * @param        integer        [$i] the last struct index 
    * @return        array 
    */ 
    function getChild(&$i) { 
        // contain node data 
        $children = array(); 

        // loop 
        while (++$i < $this->_count) { 
            // node tag name 
            $tagname = $this->_struct[$i]['tag']; 
            $value = isset($this->_struct[$i]['value']) ? $this->_struct[$i]['value'] : ''; 
            $attributes = isset($this->_struct[$i]['attributes']) ? $this->_struct[$i]['attributes'] : ''; 

            switch ($this->_struct[$i]['type']) { 
                case 'open': 
                    // node has more children 
                    $child = $this->getChild($i); 
                    // append the children data to the current node 
                    $children = $this->addNode($children, $tagname, $value, $attributes, $child); 
                    break; 
                case 'complete': 
                    // at end of current branch 
                    $children = $this->addNode($children, $tagname, $value, $attributes); 
                    break; 
                case 'cdata': 
                    // node has CDATA after one of it's children 
                    $children['value'] .= $value; 
                    break; 
                case 'close': 
                    // end of node, return collected data  
                    return $children; 
                    break; 
            } 
         
        } 
        //return $children; 
    } 

    /** 
    * Appends some values to an array 
    * 
    * @access        public 
    * @param        array        [$target] 
    * @param        string        [$key] 
    * @param        string        [$value] 
    * @param        array        [$attributes] 
    * @param        array        [$inner] the children 
    * @return        void 
    * @since         
    */ 
    function addNode($target, $key, $value = '', $attributes = '', $child = '') { 
        if (!isset($target[$key]['value']) && !isset($target[$key][0])) { 
            if ($child != '') { 
                $target[$key] = $child; 
            } 
            if ($attributes != '') { 
                foreach ($attributes as $k => $v) { 
                    $target[$key][$k] = $v; 
                } 
            } 
             
            $target[$key]['value'] = $value; 
        } else { 
            if (!isset($target[$key][0])) { 
                // is string or other 
                $oldvalue = $target[$key]; 
                $target[$key] = array(); 
                $target[$key][0] = $oldvalue; 
                $index = 1; 
            } else { 
                // is array 
                $index = count($target[$key]); 
            } 

            if ($child != '') { 
                $target[$key][$index] = $child; 
            } 

            if ($attributes != '') { 
                foreach ($attributes as $k => $v) { 
                    $target[$key][$index][$k] = $v; 
                } 
            } 
            $target[$key][$index]['value'] = $value; 
        } 
        return $target; 
    } 

}
?>

 实例一 (解析XML文件)：

<?php
$file="http://dict.cn/ws.php?q=content";
require_once('SofeeXmlParser.php');
$xml = new SofeeXmlParser();
$xml->parseFile($file); 
$tree = $xml->getTree();
unset($xml);
print "<pre>";
foreach($tree as $val){
	echo $val['key']['value'];
	echo $val['lang']['value'];
}
print "</pre>";
?>

实例二 (解析XML字符串)：

<?php
$str = '<?xml version="1.0" encoding="gb2312"?>
<root>
  <info value="adevy">
    <name>adevy001</name>
    <sex>男</sex>
  </info>
  <info value="adevy">
    <name>adevy001</name>
    <sex>男</sex>
  </info>
</root>';
require_once('SofeeXmlParser.php');
$xml = new SofeeXmlParser();
$xml->parseString($str);
$tree = $xml->getTree();
unset($xml);
print "<pre>";
print_r($tree);
print "</pre>";
?>