Comments on: Understanding Abstract Classes in PHP http://aleembawany.com/2010/04/03/understanding-abstract-classes-in-php/ tech, web and the rest Fri, 27 Jan 2012 13:37:43 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: jpeltor http://aleembawany.com/2010/04/03/understanding-abstract-classes-in-php/comment-page-1/#comment-48768 jpeltor Tue, 27 Dec 2011 22:43:32 +0000 http://aleembawany.com/?p=934#comment-48768 <p>Awesome. I am still a little confused regarding the usefulness of abstract classes. Isn't the same thing accomplished using regular classes?</p> Awesome. I am still a little confused regarding the usefulness of abstract classes. Isn’t the same thing accomplished using regular classes?

]]> By: M.Umesh http://aleembawany.com/2010/04/03/understanding-abstract-classes-in-php/comment-page-1/#comment-48734 M.Umesh Tue, 27 Dec 2011 04:52:50 +0000 http://aleembawany.com/?p=934#comment-48734 <p>thank you for your tutorials. Actually it was very helpfull to easily understand the core concept of abstract class in php.</p> thank you for your tutorials. Actually it was very helpfull to easily understand the core concept of abstract class in php.

]]> By: Willem van der Berg http://aleembawany.com/2010/04/03/understanding-abstract-classes-in-php/comment-page-1/#comment-42581 Willem van der Berg Wed, 03 Aug 2011 13:15:03 +0000 http://aleembawany.com/?p=934#comment-42581 <p>Nice article, well explained. Just one little nagging comment: although the example is solid, unfortunately you don't drive but ride a motorcycle... which would still make it awkward to call drive() in the Motorcycle class that extends your abstract class :)</p> Nice article, well explained. Just one little nagging comment: although the example is solid, unfortunately you don’t drive but ride a motorcycle… which would still make it awkward to call drive() in the Motorcycle class that extends your abstract class :)

]]> By: ahmad sayeed http://aleembawany.com/2010/04/03/understanding-abstract-classes-in-php/comment-page-1/#comment-34110 ahmad sayeed Mon, 11 Oct 2010 06:11:49 +0000 http://aleembawany.com/?p=934#comment-34110 <p>Good post , but please elaborate Interface more</p> Good post , but please elaborate Interface more

]]> By: Sarfraz Ahmed http://aleembawany.com/2010/04/03/understanding-abstract-classes-in-php/comment-page-1/#comment-32620 Sarfraz Ahmed Fri, 14 May 2010 20:17:50 +0000 http://aleembawany.com/?p=934#comment-32620 <p>Good post in the first place. Just to add more abstract classes, unlike interfaces, are classes. Here are some more characteristics of both of them:</p> <ul><li><p>Abstract classes can have consts, members, method stubs and defined methods, whereas interfaces can only have consts and methods stubs.</p></li> <li><p>Methods and members of an abstract class can be defined with any visibility, whereas all methods of an interface must be defined as public.</p></li> <li><p>When inheriting an abstract class, the child class must define the abstract methods, whereas an interface can extend another interface and methods don't have to be defined.</p></li> <li><p>A child class can only extend a single abstract (or any other) class, whereas an interface can extend or a class can implement multiple other interfaces.</p></li> <li><p>A child class can define abstract methods with the same or less restrictive visibility, whereas a class implementing an interface must define the methods with the exact same visibility.</p></li> </ul> Good post in the first place.
Just to add more abstract classes, unlike interfaces, are classes. Here are some more characteristics of both of them:

  • Abstract classes can have consts, members, method stubs and defined methods, whereas interfaces can only have consts and methods stubs.

  • Methods and members of an abstract class can be defined with any visibility, whereas all methods of an interface must be defined as public.

  • When inheriting an abstract class, the child class must define the abstract methods, whereas an interface can extend another interface and methods don’t have to be defined.

  • A child class can only extend a single abstract (or any other) class, whereas an interface can extend or a class can implement multiple other interfaces.

  • A child class can define abstract methods with the same or less restrictive visibility, whereas a class implementing an interface must define the methods with the exact same visibility.

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