objects

Object-Oriented PHP: Working with Inheritance

26 May 2011 / 2 Comments

Welcome to my third object-oriented PHP tutorial! If you haven’t already checked out the first two then you may want to take a look at those first, since this tutorial builds on the previous two:

In this article we’re going to explore the idea of inheritance in object-oriented programming, and how inheritance works in PHP. With inheritance, your objects and classes can become much more powerful and flexible, and you can save a lot of time and effort with your coding.

We’ll look at the following topics in this article:

The concept of inheritance, and why it’s so useful
How one PHP class can inherit from another
How a child class can override some of the functionality of its parent
Working with final classes and methods
Using abstract classes, and
Working with interfaces.

Ready? Let’s get started!

Object-Oriented PHP for Absolute Beginners

8 April 2011 / 10 Comments

Welcome to the first in a series of tutorials covering object-oriented programming in PHP. In this series you’ll explore the various ideas and concepts involved in object-oriented programming, and learn how to build robust object-oriented PHP applications quickly and easily.

In this tutorial, we’re going to kick things off nice and gently by looking at some really basic concepts of object-oriented programming. You’re going to learn:

What object-oriented programming is
How object-oriented programming can help you write better PHP scripts
Some fundamental concepts, including classes, objects, methods and properties, and
How to start writing object-oriented PHP code.

Ready to explore the world of PHP objects? Let’s get started!

PHP References: How They Work, and When to Use Them

19 November 2010 / 18 Comments

References are a very useful part of PHP and, for that matter, most other programming languages. However, references can be somewhat confusing when you first start learning about them.

This tutorial is a gentle introduction to references in PHP. You find out what references are, and how they work. You learn how to create and delete references, as well as pass references to and from functions. You also explore some other uses of references, and discover situations where PHP creates references automatically on your behalf.

Retrieving Page Elements via the DOM

31 October 2008 / Leave a Comment

In the last DOM article, you learned that the DOM represents the contents of a Web page as a “tree” of JavaScript objects. By accessing the parts of the tree, called the nodes, you can read existing page content, alter content, and even add new content from scratch.

In this article you’ll learn how to locate and retrieve the elements of a Web page using JavaScript and the DOM.

Introducing the JavaScript DOM

3 October 2008 / Leave a Comment

The Document Object Model lets you access and manipulate the contents of Web pages using JavaScript. By using the DOM, you can do wonderful things like:

Create tabbed Web pages
Create expandable/collapsible (“accordion”-style) Web page elements
Generate Web page content dynamically (on the fly)

In this introductory article, you learn about the concept of the DOM, and how it’s used to access Web page elements from within JavaScript.

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