Creating components

If you have some code that looks like it can be reused, but you don't know if it's a behavior, widget, or something else, most probably it's a component . A component should be inherited from CComponent or CApplicationComponent. Later on, the component can be attached to the application and configured using the protected/config/main.php configuration file. That's the main benefit compared to using just a plain PHP class. Additionally, we are getting behaviors, events, getters, and setters support.

For our example we'll implement a simple EImageManager application component that will be able to resize images using the GD library, attach it to the application, and use it.

Getting ready

You will need to install the GD PHP extension to see image resizing in action.

How to do it...

1. Create protected/components/EImageManager.php:

   <?php
   class EImageManager extends CApplicationComponent
   {
     protected $image;
     protected $width;
     protected $height;
   
     protected $newWidth;
     protected...