将xml文件转换成以为数组

<?php
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
class XmlToArray {
    function __construct() {
        
    }
    function xml2array($contents, $get_attributes=1, $priority = 'tag') {
        if (!$contents)
            return array();
        if (!function_exists('xml_parser_create')) {
            //print "'xml_parser_create()' function not found!";
            return array();
        }
        //Get the XML parser of PHP - PHP must have this module for the parser to work
        $parser = xml_parser_create('');
        xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8"); # http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
        xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
        xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
        xml_parse_into_struct($parser, trim($contents), $xml_values);
        xml_parser_free($parser);
        if (!$xml_values)
            return; //Hmm...
            
//Initializations
        $xml_array = array();
        $parents = array();
        $opened_tags = array();
        $arr = array();
        $current = &$xml_array; //Refference
        //Go through the tags.
        $repeated_tag_index = array(); //Multiple tags with same name will be turned into an array
        foreach ($xml_values as $data) {
            unset($attributes, $value); //Remove existing values, or there will be trouble
            //This command will extract these variables into the foreach scope
            // tag(string), type(string), level(int), attributes(array).
            extract($data); //We could use the array by itself, but this cooler.
            $result = array();
            $attributes_data = array();
            if (isset($value)) {
                if ($priority == 'tag')
                    $result = $value;
                else
                    $result['value'] = $value; //Put the value in a assoc array if we are in the 'Attribute' mode
            }
            //Set the attributes too.
            if (isset($attributes) and $get_attributes) {
                foreach ($attributes as $attr => $val) {
                    if ($priority == 'tag')
                        $attributes_data[$attr] = $val;
                    else
                        $result['attr'][$attr] = $val; //Set all the attributes in a array called 'attr'
                }
            }
            //See tag status and do the needed.
            if ($type == "open") {//The starting of the tag '<tag>'
                $parent[$level - 1] = &$current;
                if (!is_array($current) or (!in_array($tag, array_keys($current)))) { //Insert New tag
                    $current[$tag] = $result;
                    if ($attributes_data)
                        $current[$tag . '_attr'] = $attributes_data;
                    $repeated_tag_index[$tag . '_' . $level] = 1;
                    $current = &$current[$tag];
                } else { //There was another element with the same tag name
                    if (isset($current[$tag][0])) {//If there is a 0th element it is already an array
                        $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result;
                        $repeated_tag_index[$tag . '_' . $level]++;
                    } else {//This section will make the value an array if multiple tags with the same name appear together
                        $current[$tag] = array($current[$tag], $result); //This will combine the existing item and the new item together to make an array
                        $repeated_tag_index[$tag . '_' . $level] = 2;
                        if (isset($current[$tag . '_attr'])) { //The attribute of the last(0th) tag must be moved as well
                            $current[$tag]['0_attr'] = $current[$tag . '_attr'];
                            unset($current[$tag . '_attr']);
                        }
                    }
                    $last_item_index = $repeated_tag_index[$tag . '_' . $level] - 1;
                    $current = &$current[$tag][$last_item_index];
                }
            } elseif ($type == "complete") { //Tags that ends in 1 line '<tag />'
                //See if the key is already taken.
                if (!isset($current[$tag])) { //New Key
                    $current[$tag] = $result;
                    $repeated_tag_index[$tag . '_' . $level] = 1;
                    if ($priority == 'tag' and $attributes_data)
                        $current[$tag . '_attr'] = $attributes_data;
                } else { //If taken, put all things inside a list(array)
                    if (isset($current[$tag][0]) and is_array($current[$tag])) {//If it is already an array...
                        // ...push the new element into that array.
                        $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result;
                        if ($priority == 'tag' and $get_attributes and $attributes_data) {
                            $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data;
                        }
                        $repeated_tag_index[$tag . '_' . $level]++;
                    } else { //If it is not an array...
                        $current[$tag] = array($current[$tag], $result); //...Make it an array using using the existing value and the new value
                        $repeated_tag_index[$tag . '_' . $level] = 1;
                        if ($priority == 'tag' and $get_attributes) {
                            if (isset($current[$tag . '_attr'])) { //The attribute of the last(0th) tag must be moved as well
                                $current[$tag]['0_attr'] = $current[$tag . '_attr'];
                                unset($current[$tag . '_attr']);
                            }
                            if ($attributes_data) {
                                $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data;
                            }
                        }
                        $repeated_tag_index[$tag . '_' . $level]++; //0 and 1 index is already taken
                    }
                }
            } elseif ($type == 'close') { //End of tag '</tag>'
                $current = &$parent[$level - 1];
            }
        }
        return $xml_array;
    }
}
?>

<?php
/**
 *用递归法将返回的多维数组存进一维数组
 */
    function datatosession($array) {
        foreach ($array as $key => $value) {
            if (is_array($value) && $value != null) {
                $this->datatosession($value);
            } else {
                if (is_string($value)) {
                    $_SESSION["$key"] = $value;
                }
            }
        }
    }
 
?>