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Object-Oriented Programming (OOP) Basics

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Object-Oriented Programming (OOP) Basics

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Questions and Answers

What is the primary concept of Object-Oriented Programming?

Considering everything in the world as an object (correct)

Considering everything in the world as a method

Considering everything in the world as a function

Considering everything in the world as a variable

What is the purpose of a class in OOP?

To store data in a database

To define a blueprint for objects (correct)

To create individual objects

To implement a specific method

What happens when individual objects are created from a class?

They inherit all properties and behaviors from the class with the same values

They inherit only the methods from the class

They do not inherit any properties or behaviors from the class

They inherit all properties and behaviors from the class but with different values (correct)

How is a class defined in PHP?

Using the class keyword Signup and view all the answers

What is a requirement for a class name in PHP?

It must start with a letter Signup and view all the answers

How do you add properties to a class?

By placing variables inside the class Signup and view all the answers

What is used to define a method in a class?

The keyword function Signup and view all the answers

What are the three visibility modifiers that a property or method can have?

public, private, protected Signup and view all the answers

What is the main goal of relating programming with the real world through OOP?

To create a direct representation of real-world entities Signup and view all the answers

What is the relationship between a class and its properties in OOP?

A class holds its properties via variables Signup and view all the answers

What is the correct way to define a class in PHP?

Using the <code>class</code> keyword Signup and view all the answers

What happens when an object is created from a class?

The object inherits all properties and behaviors from the class Signup and view all the answers

What is the purpose of variables in OOP?

To hold the properties of an object Signup and view all the answers

What is the relationship between a class and its objects?

A class is a template for objects Signup and view all the answers

Study Notes

OOP Concepts

OOP considers everything in the world as an object, which is an entity that holds its own properties (data) via variables and behaviors (functions) via methods.

Classes & Objects

A class is a blueprint/template used to hold objects along with their behavior and properties.
An object is an instance/occurrence of a class.
A class can have properties (e.g. make, color, year, speed limit) and behaviors (functions).
Objects inherit all properties and behaviors from the class, but each object will have different values for the properties.

Defining a PHP Class

A class is defined using the class keyword, followed by the name of the class and a pair of curly braces {}.
Class name should start with a letter, cannot be a PHP reserved word, and cannot contain spaces.
Properties and methods are defined inside the curly braces.

Adding Properties & Methods to a Class

Properties are added to a class by placing variables inside it.
Methods are defined using the function keyword before the name of the function.
Properties and methods can have one of three visibility modifiers: public, private, and protected.