Home arrow PHP arrow Page 4 - Building Dynamic Web Pages with Polymorphism in PHP 5

Seeing some polymorphic objects in action - PHP

If you’re starting to delve deeper into object-oriented programming with PHP, and also want to know how to include polymorphic objects into your own scripts, this might be the right opportunity to learn more about this interesting topic. Welcome to the second part of the series that began with “Using polymorphism with objects in PHP 5.” In three articles, this series provides you with a comprehensive guide on how to take advantage of polymorphism to build more efficient object-based PHP applications.

TABLE OF CONTENTS:
  1. Building Dynamic Web Pages with Polymorphism in PHP 5
  2. Building web pages using Polymorphism
  3. Extending the concept of polymorphic classes
  4. Seeing some polymorphic objects in action
By: Alejandro Gervasio
Rating: starstarstarstarstar / 15
March 28, 2007

print this article
SEARCH DEV SHED

TOOLS YOU CAN USE

advertisement

As I stated in the section that you just read, at this moment I'd like to create an educational example where all the classes that were defined previously are put to work in conjunction. As you'll see in the next few lines, the purpose of developing this example is to demonstrate how a small set of polymorphic objects can be used to create a complete web document.

But, I don't want to bore you with irrelevant details any longer, therefore pay attention to the following code sample, please:  

try{
   // build array of web page objects
  $elements=array(new H1('This is an H1 header','',''),new H2
('This is an H2 header','',''),new H3('This is an H3
header','',''),new Paragraph('This is a
paragraph','parid','parclass'),new Div('This is a
DIV','divid','divclass'),new Link('This is a
link','linkid','linkclass','default,htm'));
   // display web page elements using polymorphism
   foreach($elements as $element){
     echo $element->display();
   }
}
catch(Exception $e){
   echo $e->getMessage();
   exit();
}

Even when the signature of the above script is short, it demonstrates in a nutshell how polymorphism can be used to generate a simple web page. Our page includes three headers and one paragraph, one containing DIV and finally a regular link.

Nonetheless, the most interesting detail to notice here is how the same "display()" method is called by the different web page objects within a "foreach" construct to build the web document in question. Precisely, this condition is demonstrated by the following code block:

foreach($elements as $element){
  echo $element->display();
}

All right, now that you have learned how to take advantage of polymorphism, I suggest you start using this fundamental pillar of object-oriented programming when you build your own PHP applications.

Final thoughts

Sad but true, we've come to the end of this tutorial. In this second installment of the series, I provided you with a clear example of how to use polymorphic objects to build dynamic web documents.

However, if you think this educational journey has finished, I'm afraid you're wrong. There's still one last article to read, where I'll explain how to utilize the benefits of polymorphism to validate user-supplied data. You've been warned, so don't miss it!



 
 
>>> More PHP Articles          >>> More By Alejandro Gervasio
 

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: