PHP class for reading xml

#------------------------------------------
#
# XML Library, by Keith Devens, version 1.2b
# http://keithdevens.com/software/phpxml
#
# This code is Open Source, released under terms similar to the Artistic License.
# Read the license at http://keithdevens.com/software/license
#
#------------------------------------------
# XML_unserialize: takes raw XML as a parameter (a string)
# and returns an equivalent PHP data structure
#------------------------------------------
function & XML_unserialize(&$xml){
    $xml_parser = &new XML();
    $data = &$xml_parser->parse($xml);
    $xml_parser->destruct();
    return $data;
}
-----------------------#####
# XML_serialize: serializes any PHP data structure into XML
# Takes one parameter: the data to serialize. Must be an array.
-----------------------#
function & XML_serialize(&$data, $level = 0, $prior_key = NULL){
    if($level == 0){ ob_start(); echo '',"n"; }
    while(list($key, $value) = each($data))
        if(!strpos($key, ' attr')) #if it's not an attribute
            #we don't treat attributes by themselves, so for an empty element
            # that has attributes you still need to set the element to NULL
            if(is_array($value) and array_key_exists(0, $value)){
                XML_serialize($value, $level, $key);
            }else{
                $tag = $prior_key ? $prior_key : $key;
                echo str_repeat("t", $level),'<',$tag;
                if(array_key_exists("$key attr", $data)){ #if there's an attribute for this element
                    while(list($attr_name, $attr_value) = each($data["$key attr"]))
                        echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"';
                    reset($data["$key attr"]);
                }
                if(is_null($value)) echo " />n";
                elseif(!is_array($value)) echo '>',htmlspecialchars($value),"n";
                else echo ">n",XML_serialize($value, $level+1),str_repeat("t", $level),"n";
            }
    reset($data);
    if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; }
}
#-----------------------#
# XML class: utility class to be used with PHP's XML handling functions
#-----------------------#
class XML{
    var $parser;   #a reference to the XML parser
    var $document; #the entire XML structure built up so far
    var $parent;   #a pointer to the current parent - the parent will be an array
    var $stack;    #a stack of the most recent parent at each nesting level
    var $last_opened_tag; #keeps track of the last tag opened.
    function XML(){
         $this->parser = &xml_parser_create();
        xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false);
        xml_set_object(&$this->parser, &$this);
        xml_set_element_handler(&$this->parser, 'open','close');
        xml_set_character_data_handler(&$this->parser, 'data');
    }
    function destruct(){ xml_parser_free(&$this->parser); }
    function & parse(&$data){
        $this->document = array();
        $this->stack    = array();
        $this->parent   = &$this->document;
        return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL;
    }
    function open(&$parser, $tag, $attributes){
        $this->data = ''; #stores temporary cdata
        $this->last_opened_tag = $tag;
        if(is_array($this->parent) and array_key_exists($tag,$this->parent)){ #if you've seen this tag before
            if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])){ #if the keys are numeric
                #this is the third or later instance of $tag we've come across
                $key = count_numeric_items($this->parent[$tag]);
            }else{
                #this is the second instance of $tag that we've seen. shift around
                if(array_key_exists("$tag attr",$this->parent)){
                    $arr = array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]);
                    unset($this->parent["$tag attr"]);
                }else{
                    $arr = array(&$this->parent[$tag]);
                }
                $this->parent[$tag] = &$arr;
                $key = 1;
            }
            $this->parent = &$this->parent[$tag];
        }else{
            $key = $tag;
        }
        if($attributes) $this->parent["$key attr"] = $attributes;
        $this->parent  = &$this->parent[$key];
        $this->stack[] = &$this->parent;
    }
    function data(&$parser, $data){
        if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags
            $this->data .= $data;
    }
    function close(&$parser, $tag){
        if($this->last_opened_tag == $tag){
            $this->parent = $this->data;
            $this->last_opened_tag = NULL;
        }
        array_pop($this->stack);
        if($this->stack) $this->parent = &$this->stack[count($this->stack)-1];
    }
}
function count_numeric_items(&$array){
    return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0;
}
?>

Application example, XML source address: http://data.cnaz.com/spread/?tid=7&sid=42845&order=date&flags=desc&num=50 &page=1&hosts=pic.ttiankan.com&code=xml

include('xml.php'); //Reference PHP XML operation class
$page=$_GET['page '];
if(empty($page) || !is_numeric($page)) $page=1;
//Idol star
$ xml = file_get_contents('http://data.cnaz.com/spread/?tid=7&sid=42845&order=date&flags=desc&num=50
&page='.$page.'&hosts=pic.ttiankan.com&code=xml');

//$xml = file_get_contents("php://input"); //Read the input stream from POST
$data=XML_unserialize($xml);
$item=$data['rss']['channel'];
$link = $item['link'];
$description= $item[ 'description'];
$keywords = $item['keywords'];
$totalnum = $item['totalnum'];
$usetime = $item['usetime'];

echo('Keywords:'.$keywords.' ');
echo('Total number of records:'.$totalnum.', 50 records per page, total '.$totalpage.' Page, currently page '.$page.'

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