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OOP in PHP Quiz

OOP in PHP Quiz

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Questions and Answers

OOP in PHP stands for what?

Object-Oriented Programming

What does a class act as in OOP?

A collection of variables
A method for initializing objects
An instance of an object
A blueprint for creating objects (correct)

What is an object in OOP?

A blueprint for creating classes
A variable that stores data
A method inside a class
An instance of a class (correct)

What is a constructor in PHP OOP?

<p>A special method automatically called when an object is created.</p> Signup and view all the answers

What does the `public` access modifier indicate?

<p>Accessible from anywhere (B)</p> Signup and view all the answers

What does the `private` access modifier indicate?

<p>Accessible only within the class (D)</p> Signup and view all the answers

What is PHP inheritance?

<p>A mechanism that allows a class to inherit properties and methods from another class.</p> Signup and view all the answers

What is a PHP constant?

<p>A value that cannot be changed once it is defined.</p> Signup and view all the answers

How are PHP constants defined?

<p>Using the <code>const</code> keyword (B), Using the <code>define()</code> function (C)</p> Signup and view all the answers

Flashcards

What is OOP?

A programming paradigm that uses objects to organize code, making it more modular, reusable, and maintainable.

PHP Class

A blueprint or template for creating objects. It defines the structure (properties) and behavior (methods) of objects.

PHP Object

An instance or specific example of a class. It holds data according to the class's definition.

PHP Properties

Variables inside a class that store data for an object.

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PHP Methods

Functions inside a class that define the actions or behaviors of an object.

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PHP Constructor

A special method called automatically when a new object is created. It's often used to initialize properties.

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PHP Destructor

A special method called automatically when an object is destroyed. It's used for cleanup tasks.

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PHP Access Modifiers

Keywords like 'public', 'private', and 'protected' that control the visibility and accessibility of properties and methods.

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PHP Inheritance

The ability for a class to inherit properties and methods from another class, promoting code reuse.

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PHP Constants

Named constants that are fixed values that cannot be changed throughout the script.

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Study Notes

OOP in PHP

Object-Oriented Programming (OOP) is a programming paradigm based on the concept of "objects."
Objects in OOP contain data (attributes) and code (methods).
OOP allows for better code modularity, reusability, and organization.

Key Concepts

Class: A blueprint for creating objects. Classes define properties (data) and methods (functions) for an object.
Object: An instance of a class. When you create an object from a class, you use it to access class properties and methods.
Properties: Variables defined within a class.
Methods: Functions defined within a class, used to perform actions on object properties.

PHP Classes and Objects

Classes are blueprints for objects. An object is an instance of a class.
Example: A class Car with properties model and color and a method drive().

PHP Constructor

A special method automatically called when an object is created.
Typically used to initialize object properties.
Example: A constructor in the Car class to set the model and color.

PHP Destructor

A special method automatically called when an object is destroyed (e.g., when the script ends or the object is no longer needed).
Commonly used for cleanup tasks, such as closing files or database connections.
Example: A destructor to close a database connection when an object is destroyed.

PHP Access Modifiers

Define the visibility of class properties and methods.
Public: Accessible from anywhere.
Private: Accessible only within the class itself.
Protected: Accessible within the class and by classes derived from it.
Example: Public properties for name and age that can be accessed elsewhere, private property for age that can only be used within the class.

PHP Inheritance

Allows a class to inherit properties and methods from another class (the parent class).
The child class (derived class) inherits all methods and properties of the parent class.
Child classes can also add new properties or methods or override existing ones.
Example; Bicycle class inheriting properties and methods from Vehicle class.

PHP Constants

Constants are like variables but their values cannot be changed after initialization.
Class constants are defined using the const keyword.
Example: MathConstants::PI, used to access the value of pi.

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Related Documents

Lesson Plan: Introduction to PHP OOP PDF

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