[PHP] XML解析类

来源：http://blog.00isp.com/technology/php/20100216/45.html

<?
/**
 * +----------------------------------------------------------------------+ 
 * | 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          | 
 * | license@sofee.cn so we can mail you a copy immediately.              | 
 * +----------------------------------------------------------------------+ 
 * | Author: Justin Wu <ezdevelop@gmail.com>                              | 
 * +----------------------------------------------------------------------+
 */

/**
 * $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 <wenlong@php.net> 
 * @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;
    }
}

?>

<?
// require_once('SofeeXmlParser.php');
// 实例一 (解析XML文件)：
$file = 'settings/config.xml';
$xml = new SofeeXmlParser();
$xml->parseFile($file);
$tree = $xml->getTree();
unset($xml);
print "<pre>";
print_r($tree);
print "</pre>";

// 实例二 (解析XML字符串)：
$str = file_get_contents("settings/config.xml");
$xml = new SofeeXmlParser();
$xml->parseString($str);
$tree = $xml->getTree();
unset($xml);
print "<pre>";
print_r($tree);
print "</pre>";
?>