OOP Concepts in PHP
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Questions and Answers

What is the main concept of OOP in programming?

  • To write faster code
  • To consider everything as an object with its own properties and behaviors (correct)
  • To create complex algorithms
  • To use only functions in programming
  • What is the purpose of a class in OOP?

  • To hold the properties and behaviors of an object (correct)
  • To define the visibility of a method
  • To create a new function
  • To create multiple instances of an object
  • What is an object in OOP?

  • An instance or occurrence of a class (correct)
  • A function that performs a specific task
  • A variable that holds a value
  • A blueprint for creating other objects
  • What happens when an individual object is created from a class?

    <p>It inherits all the properties and behaviors from the class, but each object will have different values for the properties</p> Signup and view all the answers

    How do you define a PHP class?

    <p>Using the class keyword followed by the name of the class and a pair of curly braces</p> Signup and view all the answers

    What are the three visibility modifiers in PHP?

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

    How do you add properties to a class in PHP?

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

    What is the correct syntax for defining a method in a PHP class?

    <p>Using the function keyword before the name of the function</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 the blueprint/template that is used to hold objects along with their behavior and properties.
    • An object is simply an instance/occurrence of the class.
    • A class can have properties like make, color, year, speed limit, etc.
    • Objects inherit all the properties and behaviors from the class, but each object will have different values for the properties.

    Defining a PHP Class

    • A class is defined by using the class keyword, followed by the name of the class and a pair of curly braces ({}).
    • The class name should start with a letter, cannot be a PHP reserved word, and cannot contain spaces.
    • All properties and methods go inside the curly braces.

    Adding Properties & Methods to a Class

    • Properties are added to the 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 the three visibility modifiers: public, private, and protected.
    • If a method is defined without any visibility modifier, it defaults to public.

    Calling Member Functions

    • After creating an object, you can use it to call the member functions or assign values to the data members (property) of that class.
    • To access a property, you use the object operator (-&gt;).
    • To call a method, you also use the object operator (-&gt;).

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    Description

    Learn about Object-Oriented Programming concepts, including classes, objects, and more in the context of PHP and Advanced Web Technologies.

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