What do classes, objects, and methods in php mean?

A class in php refers to a representative of a common transaction; an object refers to a specific representative of a certain type of transaction, also called an instance; a method refers to a function created in a class structure, also called a member method , member function.

Detailed introduction:

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Class: class is the outermost structure that defines the object-oriented subject, and is also used to wrap the subject data and functions (functions). Class is the representative of a class of common transactions and represents the commonality of transactions.

Object: object is a specific representative of a certain type of transaction and a specific unit of actual data and functional operations. It is also called an instance.

Instantiation: new, the process of obtaining a specific instance that conforms to the abstract concept from an abstract concept.

Class member: member, refers to all contents in the class structure, there are three types of class members;

Method: method, which is essentially a function created in the class structure, also known as Member methods, or member functions.

Attribute: property is essentially a variable created in the class structure, also called a member variable.

Class constant: constant, essentially a constant created in the class structure.

Example:

<?php
//使用class关键字  定义类

class Myclass{
    //定义类的属性，前面必须要加访问修饰符
    public $name=&#39;杜威&#39;;
    //定义类的函数(方法)，前面可以省略访问修饰符，默认是public
    public function show(){
        //在方法中向访问属性，可以使用$this。
        echo $this->name;
        //也可以使用这种
        // $mynme=new Myclass();
        // echo $mynme->name;
    }
}
//使用new关键字实例化类Myclass,下面两种方法都是可以的，
//由于实例化对象没有保存，所以输出的时候都会显示 object (Myclass)[1]
// new Myclass;
// new Myclass();


$sb=new Myclass();
$sb->show();   //输出杜威
?>

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