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Object-Oriented PHP Basics

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What is Object-Oriented Programming?

3:20 with Alena Holligan

We’ll take the basic programming concepts you already know and show you how to think about software in terms of objects.

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    For many PHP programmers, object oriented programming is an intimidating concept, 0:00
    because it introduces new syntax and seemingly complex terminology. 0:05
    At a glance, object oriented programming can appear to be far more complex 0:10
    than simple procedural or inline code. 0:15
    However, this doesn't have to be the case. 0:18
    As you'll see, object oriented programming 0:21
    is actually similar to the way we perceive the real world. 0:24
    That means an object oriented approach 0:28
    can help you visualize the solution to a problem more easily. 0:30
    Object oriented programming or OOP for short, is a style of coding that 0:34
    allows developers to group similar tasks into containers. 0:39
    In php, containers are defined using classes. 0:43
    A class contains all the functions and variables that define an object. 0:47
    These functions are called methods and the variables are called properties. 0:53
    [SOUND] To give you a real world example of this, let's take a look at a house. 0:56
    A house defined by a blueprint which shows the layout, rooms and 1:01
    exact design for the house. 1:06
    Each house has attributes like walls, a roof, windows and doors. 1:09
    They also have actions such as open the door or turn on the light. 1:15
    The blueprint could be the class. 1:21
    It's not a house itself, but it describes how a house should be built, 1:23
    with relationships between the different parts of the house clearly defined and 1:27
    planned out. 1:31
    The walls, roof, windows, and doors are properties. 1:33
    While opening the door and turning on the lights are methods. 1:37
    As I just mentioned a blueprint is not a house. 1:42
    But you use a blueprint to build new houses. 1:45
    Each time a new house is built, we create a new object, a house object. 1:49
    If our blueprint is a class named house, 1:55
    we can build an entire subdivision of houses based on this blueprint. 1:58
    This is called instantiating an object or creating an instance of an object. 2:03
    Each house object shares the properties and methods of the house class. 2:10
    But the individual values for each house may be different. 2:14
    My house may have brown walls and a red roof. 2:19
    While your house could have white walls and a blue roof. 2:23
    Grouping code into these containers, or classes, can make it easier to 2:28
    follow the tenet, don't repeat yourself, or D-R-Y, dry for short. 2:32
    One of the major benefits in following the DRY principle is that, 2:37
    if a piece of information changes in your program, 2:41
    you usually only need to change the code in one place. 2:44
    One of the biggest nightmares for developers, 2:48
    is maintaining code where data is declared over and over again. 2:50
    If something goes wrong tracking down the error can be like looking for 2:56
    a needle in a haystack. 3:00
    As you hunt for duplicated data and 3:01
    functionality, sometimes finding that needle can be painful. 3:03
    This course is designed to teach you the why and 3:08
    how of object oriented programming. 3:11
    Before we jump feet first into the how, 3:14
    let's get a little more familiar with the why. 3:16

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