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19 Jul 2012CPOL
Introduction
I am not a huge fan of PHP but I likethe way PHP is turning into object oriented language. Still there arelot of things to make PHP fully OOL, there are plenty of support todevelop enterprise level application using PHP. The usage of objectvia interface and class make PHP developer to develop reusable,modular solution. In this article I am giving the overview ofimplementing MVC in PHP.
What is MVC?
MVC is design framework which decreasesthe coupling between the objects by separating business object(Model), user interface (View) and business logic (Controller). Keepin mind that MVC is not specific to any particular language and canbe implemented in different languages. It is easy to implement MVC inthe languages which supports OBJECT.
MVC in Action
I am using an MVC pattern to displayvideos from YouTube in our page. Of course, you can achieve this withon PHP file and some code. But when your application grows and needsmaintenance it will be nightmare to maintain such application. Butwhen you separate your business logic and UI, you can maintain andtest them easily. You can get rid of tight coupling by use thedependency injection (DI via interface and constructor).
Controller constructor accepts threeparameters: a model, a view and a feed URL. As there is no way in PHPto say type of variable, we can pass any variable type. You canutilize comment and documentation in some extent to enforce passingonly certain type of variables.
Note that I have used xpath to visitnode and create Video object.
Model Interface
In our application we have two types ofbusiness objects: IVideo and IVideoCollection. Yes, second is the collection of first . Why are you using interface? Because theremay be separate operations and attributes for different types ofvideos (For example from YouTube or from MetaCafe). Our modelinterface contains basic operation that every concrete class shouldhave.
Also note that I have used namespace inPHP. It is good to see PHP supporting namespace but sadly it isnowhere near to C#, Java (package). May be in future PHP will makethem more usable.
View Class
Now let's look at a View Class. Our viewclass is implementing
IVideoView
interface. As the name suggests itdisplays the model. It just calls another file which contains HTML. Open Source Code Free Download Php
Other Classes
Index.php creates a new instanceof Controller and calls its invoke method (Isn't it simple?).There is not any dirty code in index.php. To enable auto-loading ofclasses, we are using sp_auto_register function via Loader class.
XmlParser
is used to load feeds and needs lot of improvements. Conclusion
This is very simple example ofutilizing MVC framework in PHP and may need lot of improvements. AsPHP has started supporting object oriented programming, it is becomingeasier in PHP to develop and maintain enterprise level application.
If you are familiar with ASP.NET MVC framework, you may aware that how different URL calls the different function of the same controller. There is a framework called Symfony, which is very similar to the .NET MVC framework and it is completely object oriented framework.
Future version of Drupal (Version 8) is also utilizing symfony framework.