In-depth explanation of the role of PHP DOMXPath in parsing XML files

In use

Example of using PHP DOMXPath:

1. <? PHP
2. Header ("Content-type: text/html;
   Charset = UTF-8 ");
3. $ Url = "http://www.google.com/ig/
   Api? Weather = shenzhen ";
4. // Load XML content
5. $ Dom = new DOMDocument ();
6. $ Dom->Load ($ url );
7. $ Xpath = new DOMXPath ($ dom );
8. $ Element = $ xpath->Query ("/xml_api_reply
   /Weather/current_conditions ")->Item (0 );
9. $ Condition = get_google_xml_data
   ($ Element, "condition ");
10. $ Temp_c = get_google_xml_data
    ($ Element, "temp_c ");
11. Echo 'Weather: ', $ condition ,'< Br />';
12. Echo 'temperature: ', $ temp_c ,'< Br />';
13. Function get_google_xml_data
    ($ Element, $ tagname ){
14. $ Tags = $ element->
    GetElementsByTagName ($ tagname );
15. // Get all $ tagnames
16. If ($ items->Length>1 ){
17. Return $ items;
18. }
19. $ Tag = $ tags->Item (0 );
20. // Obtain the first tag named after $ tagname
21. If ($ tag->HasAttributes ()){
22. // Obtain data attributes
23. $ Attribute = $ tag->
    GetAttribute ("data ");
24. Return $ attribute;
25. } Else {
26. Return false;
27. }
28. }
29. ?>

We hope that through the code example above, you can fully understand the specific usage of PHP DOMXPath.