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Questions and Answers
OOP in PHP stands for what?
OOP in PHP stands for what?
Object-Oriented Programming
What does a class act as in OOP?
What does a class act as in OOP?
What is an object in OOP?
What is an object in OOP?
What is a constructor in PHP OOP?
What is a constructor in PHP OOP?
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What does the public access modifier indicate?
What does the public access modifier indicate?
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What does the private access modifier indicate?
What does the private access modifier indicate?
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What is PHP inheritance?
What is PHP inheritance?
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What is a PHP constant?
What is a PHP constant?
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How are PHP constants defined?
How are PHP constants defined?
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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
Carwith propertiesmodelandcolorand a methoddrive().
PHP Constructor
- A special method automatically called when an object is created.
- Typically used to initialize object properties.
- Example: A constructor in the
Carclass to set themodelandcolor.
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
nameandagethat can be accessed elsewhere, private property foragethat 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;
Bicycleclass inheriting properties and methods fromVehicleclass.
PHP Constants
- Constants are like variables but their values cannot be changed after initialization.
- Class constants are defined using the
constkeyword. - Example:
MathConstants::PI, used to access the value of pi.
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Description
Test your knowledge on Object-Oriented Programming concepts in PHP. This quiz covers key elements such as classes, objects, properties, and methods, along with the role of constructors. Perfect for anyone looking to reinforce their understanding of OOP in the PHP language.
