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?

<p>Using the class keyword (D)</p> Signup and view all the answers

What is a requirement for a class name in PHP?

<p>It must start with a letter (B)</p> Signup and view all the answers

How do you add properties to a class?

<p>By placing variables inside the class (B)</p> Signup and view all the answers

What is used to define a method in a class?

<p>The keyword function (D)</p> Signup and view all the answers

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

<p>public, private, protected (C)</p> Signup and view all the answers

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

<p>To create a direct representation of real-world entities (A)</p> Signup and view all the answers

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

<p>A class holds its properties via variables (A)</p> Signup and view all the answers

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

<p>Using the <code>class</code> keyword (D)</p> Signup and view all the answers

What happens when an object is created from a class?

<p>The object inherits all properties and behaviors from the class (A)</p> Signup and view all the answers

What is the purpose of variables in OOP?

<p>To hold the properties of an object (D)</p> Signup and view all the answers

What is the relationship between a class and its objects?

<p>A class is a template for objects (B)</p> 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.

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Learn about the fundamental concepts of Object-Oriented Programming (OOP) including classes, objects, properties, and behaviors.

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