CHAPTER 2 - OBJECT ORIENTED PROGRAMMING (OOP)

Question 1

OOP stands for

Answer 1

OBJECT PROGRAMMING PROGRAMMING

Question 2

__________ ___________ __________ creating objects that contain both data and functions.

Answer 2

OOP

Question 3

__________ ____________writing procedures or functions that perform operations on the data

Answer 3

PROCEDURAL PROGRAMMING

Question 4

Advantages of OOP

Answer 4

• OOP is faster and easier to execute
• OOP provides a clear structure for the programs
• OOP helps to keep the PHP code DRY “Don’t Repeat Yourself”, and makes the code easier to maintain, modify and debug
• OOP makes it possible to create full reusable applications with less code and shorter development time.

Question 5

“DRY” stands for

Answer 5

Don’t Repeat Yourself

Question 6

It is a principle about reducing the repetition of code. You should extract out the codes that are common for the application, and place them at a single place and reuse them instead of repeating it.

Answer 6

DRY - don’t repeat yourself

Question 7

two main aspects of object-oriented programming.

Answer 7

1. classes
2. Objects

Question 8

_________ is a template for objects

Answer 8

CLASS

Question 9

_______ Instance of a class

Answer 9

OBJECT

Question 10

Define a class

Answer 10

<?php
class fruit{
//properties
//methods
}

Question 11

define public properties (note: we can also use private and protected)

Answer 11

public $name;
public $age;

Question 12

define set and get method with property name

(public $name;)

Answer 12

public function setname($n){
$this->name = $n;
}

public function getname(){
return $this->name;
}

Question 13

instantiate the class Fruit:

Answer 13

$banana = new Fruit();

($banana is the instance/object of a class fruit)

Question 14

set the name mango as the value of the instance $banana, and echo $banana.

Answer 14

$banana->setname(‘mango’);

echo $banana->getname();

Question 15

What is “$this” keyword?

Answer 15

it refers to the current object and is only available inside methods.

Question 16

change value of property $name outside the class:

Answer 16

$banana->name = “Orange”;