PHP OOP Essentials
Classes, objects, visibility, inheritance, traits, interfaces, abstract classes, static members
1What is a class in PHP?
What is a class in PHP?
Câu trả lời
A class is a blueprint that defines the properties and methods of an object. It encapsulates data (properties) and behaviors (methods) in a reusable structure. Classes allow creating multiple instances (objects) with the same structure but different values.
2How to create an instance of a class in PHP?
How to create an instance of a class in PHP?
Câu trả lời
The 'new' keyword allows instantiating a class and creating an object. For example, 'new User()' creates a new instance of the User class. If the class has a constructor, arguments can be passed directly: 'new User("John")', which automatically calls __construct() with the provided parameters.
3What is the difference between a 'public' and 'private' property in PHP?
What is the difference between a 'public' and 'private' property in PHP?
Câu trả lời
A 'public' property is accessible from outside the class (via the object or in child classes), while a 'private' property is accessible only from the class that defines it. Using 'private' encapsulates data and prevents direct access, forcing the use of getters/setters to control data manipulation. This is a recommended practice to protect data integrity.
What is the role of 'protected' visibility in PHP?
How to define a constructor in PHP?
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