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Questions and Answers
What is the primary concept of Object-Oriented Programming?
What is the purpose of a class in OOP?
What happens when individual objects are created from a class?
How is a class defined in PHP?
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What is a requirement for a class name in PHP?
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How do you add properties to a class?
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What is used to define a method in a class?
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What are the three visibility modifiers that a property or method can have?
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What is the main goal of relating programming with the real world through OOP?
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What is the relationship between a class and its properties in OOP?
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What is the correct way to define a class in PHP?
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What happens when an object is created from a class?
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What is the purpose of variables in OOP?
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What is the relationship between a class and its objects?
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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
classkeyword, 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
functionkeyword before the name of the function. - Properties and methods can have one of three visibility modifiers:
public,private, andprotected.
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Description
Learn about the fundamental concepts of Object-Oriented Programming (OOP) including classes, objects, properties, and behaviors.
