Home arrow PHP arrow Page 3 - Building XML Trees With PHP

Anatomy Class - PHP

Need to manipulate XML document trees, but don't have the DOM extension compiled into your PHP build? Take a look at XMLTree, a PEAR class that allows you to create and manipulate XML document trees without requiring the PHP DOM extension.

TABLE OF CONTENTS:
  1. Building XML Trees With PHP
  2. A Hero Is Born
  3. Anatomy Class
  4. A La Carte
  5. Slice And Dice
  6. Killing Off The Kids
  7. Rank And File
  8. Spider, Spider On The Wall...
  9. Making Friends And Influencing People
  10. Doing The Chameleon
  11. Linking Out
By: icarus, (c) Melonfire
Rating: starstarstarstarstar / 27
February 20, 2003

print this article
SEARCH DEV SHED

TOOLS YOU CAN USE

advertisement
Let's take a closer look at how I accomplished this.

1. The first step is, obviously, to include the XMLTree class


<?php // include class include("XML/Tree.php"); ?>


You can either provide an absolute path to this file, or do what most lazy programmers do - include the path to your PEAR installation in PHP's "include_path" variable, so that you can access any of the PEAR classes without needing to type in long, convoluted file paths.

2. Next, an object of the XMLTree class needs to be initialized, and assigned to a PHP variable.


<?php // instantiate object $tree = new XML_Tree(); ?>


This variable serves as the control point for future tree manipulation.

3. Every XML document must have a root element - which is where the addRoot() method comes in.


<?php // add the root element $root =& $tree->addRoot("superhero"); ?>


The addRoot() method is the starting point for your XML tree - it allows you to specify the name and content of your document's root element, and returns a Node object that can be used to graft further branches on to the document tree.

4. The Node object returned by the addRoot() method comes with methods of its own - and one of the more useful ones is the addChild() method, which allows you to add new children under that node. This method is fairly simple to use - all it needs is the name of the child element to be added, and the content and attributes (if any).


<?php // add child elements $name =& $root->addChild("name", "Peter Parker aka Spiderman"); $age =& $root->addChild("age", 21); ?>


Each call to addChild() returns another Node object, which in turn exposes an addChild() method, thereby allowing you to add branches to the tree ad infinitum. In this case, I've stopped at a two-level tree - but feel free to go as deep as you like (the example on the next page demonstrates a more complex tree).

5. Once the tree is complete, you can do something useful with it - write it to a file, pass it through a SAX parser or - as I've done here - simply output it to the screen for all to admire.


<?php // print tree $tree->dump(); ?>


The dump() method prints the entire XML document tree as is, and serves a very useful purpose in debugging long or complex trees - I'll be using it fairly frequently in the examples in this chapter.

 
 
>>> More PHP Articles          >>> More By icarus, (c) Melonfire
 

blog comments powered by Disqus
escort Bursa Bursa escort Antalya eskort
   

PHP ARTICLES

- Hackers Compromise PHP Sites to Launch Attac...
- Red Hat, Zend Form OpenShift PaaS Alliance
- PHP IDE News
- BCD, Zend Extend PHP Partnership
- PHP FAQ Highlight
- PHP Creator Didn't Set Out to Create a Langu...
- PHP Trends Revealed in Zend Study
- PHP: Best Methods for Running Scheduled Jobs
- PHP Array Functions: array_change_key_case
- PHP array_combine Function
- PHP array_chunk Function
- PHP Closures as View Helpers: Lazy-Loading F...
- Using PHP Closures as View Helpers
- PHP File and Operating System Program Execut...
- PHP: Effects of Wrapping Code in Class Const...

Developer Shed Affiliates

 


Dev Shed Tutorial Topics: