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Extending Yourself - PHP

So you know the theory behind OOP, but don't really understandits applications? Well, it's time to take objects out of the classroom andinto the real world - this article demonstrates how OOP can save you timeand effort by building a PHP-based Menu object to describe therelationships in a hierarchical menu tree. And since the proof of thepudding is in the eating, it then combines the newly-minted Menu objectwith some of the most popular JavaScript menu systems available online toshow you how cool objects really are.

TABLE OF CONTENTS:
  1. Building an Extensible Menu Class
  2. Back To Class
  3. What's On The Menu?
  4. Children And Their Parents
  5. I Say Method, You Say Madness...
  6. Rounding Up The Family
  7. Saving My Bookmarks
  8. Reaching Higher
  9. Collapsing Inwards
  10. Extending Yourself
By: Team Melonfire, (c) Melonfire
Rating: starstarstarstarstar / 6
August 10, 2001

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All the examples you've seen thus far have used the same standard API defined within the Menu object. However, this assumes one important thing - that a database table (in the format described) has already been created and populated with menu records. In case this is an unreasonable assumption for your specific requirements, you might consider adding a few method calls to add and delete nodes respectively.

<? class Menu { // other methods // function: add a record to the menu table function create_node($label, $link, $parent) { $this->query("INSERT INTO $this->table(label, link, parent) VALUES ('$label', '$link', '$parent')"); } // function: remove a record from the menu table function remove_node($id) { $this->query("DELETE FROM $this->table WHERE id = '$id'"); } } ?>
You might also want to consider developing a simple administration interface to these method calls, so that users can easily modify the menu tree via a GUI.

And that's about all for the moment. In this article, you expanded your knowledge of PHP's OOP capabilities by actually using all that theory to build something useful - a menu widget which can be used to describe the relationships within a hierarchical menu system, independent of how the menu is visually presented.

If you work with menu systems, whether on a Web site, within a Web application or on an embedded system, you might find this object a handy tool in your next development effort. If you're a novice programmer struggling to understand how OOP can make your life easier, I hope this article offered some pointers, as well as some illustration of how object-oriented programming works. And if you don't fit into either of those categories - well, I hope you found it interesting and informative, anyway.

See you soon!

Note: All examples in this article have been tested on Linux/i586 with PHP4, HIERmenus 4.0.12, and FolderTree 2.0. HIERmenus and FolderTree copyright their respective authors. Examples are illustrative only, and are not meant for a production environment. YMMV!

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

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