/*
????(c) 2000 Hans Anderson Corporation.??All Rights Reserved.
????You are free to use and modify this class under the same
????guidelines found in the PHP License.

????-----------

????bugs/me:
????http://www.hansanderson.com/php/
????me@hansanderson.com
????showstv@163.com

????-----------

????Version 1.0

????????- 1.0 is the first actual release of the class.??It's??
??????????finally what I was hoping it would be, though there
??????????are likely to still be some bugs in it.??This is
??????????a much changed version, and if you have downloaded
??????????a previous version, this WON'T work with your existing
??????????scripts!??You'll need to make some SIMPLE changes.

????????- .92 fixed bug that didn't include tag attributes

??????????(to use attributes, add _attributes[array_index]
???????????to the end of the tag in question:
????????????$xml_html_head_body_img would become
????????????$xml_html_head_body_img_attributes[0],??
???????????for example)

???????????-- Thanks to Nick Winfield
??????????????for reporting this bug.

????????- .91 No Longer requires PHP4!

????????- .91 now all elements are array.??Using objects has
??????????been discontinued.
*/

class xml_container{

????function store($k,$v) {
????????$this->{$k}[] = $v;
????}
}


/* parses the information */
/*********************************
*????類定義開始
*
*********************************/
class xml{
????
????// initialize some variables
????var $current_tag=array();
????var $xml_parser;
????var $Version = 1.0;
????var $tagtracker = array();

????/* Here are the XML functions needed by expat */


????/* when expat hits an opening tag, it fires up this function */
????function startElement($parser, $name, $attrs){

????????array_push($this->current_tag, $name); // add tag to the cur. tag array
????????$curtag = implode("_",$this->current_tag); // piece together tag

????????/* this tracks what array index we are on for this tag */

????????if(isset($this->tagtracker["$curtag"])) {
????????????$this->tagtracker["$curtag"]++;
????????}
????????else{
????????????$this->tagtracker["$curtag"]=0;
????????}

????????/* if there are attributes for this tag, we set them here. */

????????if(count($attrs)>0) {
????????????$j = $this->tagtracker["$curtag"];
????????????if(!$j) $j = 0;

????????????if(!is_object($GLOBALS[$this->identifier]["$curtag"][$j])) {
????????????????$GLOBALS[$this->identifier]["$curtag"][$j] = new xml_container;
????????????}

????????????$GLOBALS[$this->identifier]["$curtag"][$j]->store("attributes",$attrs);
????????}
????
????}// end function startElement



????/* when expat hits a closing tag, it fires up this function */
????function endElement($parser, $name) {
????????$curtag = implode("_",$this->current_tag); // piece together tag
????????
????????// before we pop it off,
????????// so we can get the correct
????????// cdata

????????if(!$this->tagdata["$curtag"]) {
????????????$popped = array_pop($this->current_tag); // or else we screw up where we are
????????????return; // if we have no data for the tag
????????}
????????else{
????????????$TD = $this->tagdata["$curtag"];
????????????unset($this->tagdata["$curtag"]);
????????}

????????$popped = array_pop($this->current_tag);
????????// we want the tag name for
????????// the tag above this, it??
????????// allows us to group the
????????// tags together in a more
????????// intuitive way.

????????if(sizeof($this->current_tag) == 0) return; // if we aren't in a tag

????????$curtag = implode("_",$this->current_tag); // piece together tag
????????// this time for the arrays

????????$j = $this->tagtracker["$curtag"];
????????
????????if(!$j) $j = 0;

????????if(!is_object($GLOBALS[$this->identifier]["$curtag"][$j])) {
????????????$GLOBALS[$this->identifier]["$curtag"][$j] = new xml_container;
????????}

????????$GLOBALS[$this->identifier]["$curtag"][$j]->store($name,$TD);
????????#$this->tagdata["$curtag"]);
????????unset($TD);
????????return TRUE;
????} // end function endElement


????/* when expat finds some internal tag character data,
???????it fires up this function */

????function characterData($parser, $cdata) {
????????$curtag = implode("_",$this->current_tag); // piece together tag
????????$this->tagdata["$curtag"] .= $cdata;
????}


????function xml($data,$identifier='xml') {???

????????$this->identifier = $identifier;

????????// create parser object
????????$this->xml_parser = xml_parser_create();

????????// set up some options and handlers
????????xml_set_object($this->xml_parser,$this);
????????xml_parser_set_option($this->xml_parser,XML_OPTION_CASE_FOLDING,0);
????????xml_set_element_handler($this->xml_parser, "startElement", "endElement");
????????xml_set_character_data_handler($this->xml_parser, "characterData");

????????if (!xml_parse($this->xml_parser, $data, TRUE)) {
????????????sprintf("XML error: %s at line %d",
????????????xml_error_string(xml_get_error_code($this->xml_parser)),
????????????xml_get_current_line_number($this->xml_parser));
????????}

????????// we are done with the parser, so let's free it
????????xml_parser_free($this->xml_parser);

????}//end constructor: function xml()


}//thus, we end our class xml

?>




操作方法：

require('class.xml.php');
$file = "data.xml";
$data = implode("",file($file)) or die("could not open XML input file");
$obj = new xml($data,"xml");


print $xml["hans"][0]->num_results[0];
for($i=0;$i print $xml["hans"][$i]->tag[0] . " ";
}

To print url attributes (if they exist):

print $xml["hans"][0]->attributes[0]["size"];