Object-oriented in PHP

This article mainly introduces object-oriented in php. Interested friends can learn about it. I hope it will be helpful to everyone.

1. Basic concepts of object-oriented

Object-oriented includes 3 parts: Object Oriented Analysis , OOA), Object Oriented Design (OOD) and Object Oriented Program (Object Oriented Program), the two key concepts of object-oriented are classes and objects.

Class:

A class is a collection of variables and methods that act on these variables.

Object:

The object is the product of instantiation of a class and is an entity.

The three major characteristics of object-oriented programming

Encapsulation, inheritance, and polymorphism.

2. Classes and Objects

Definition of classes

/**
 * 定义类，继承AnotherClass
 */
 class MyClass extends AnotherClass
 {
 	
 	function __construct(argument)
 	{
 # code...
 	}
 }

Instantiation of classes

 $user = new User("愤怒的小水滴", 16);
 echo $user->name."<br>".$user->age;

class Student extends User
{
    /* 构造函数 */
    public function __construct($name, $age, $school)
    {
        parent::__construct($name, $age);
    }
    /* 析构函数 */
    public function __destruct()
    {
        parent::__destruct();
    }
}

 $student = new Student("愤怒的小水滴", 16, 'hebei');
 echo json_encode($student)."<br>";

Variable declarators can be public or private , protected, static, final.

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