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 $name='杜威'; //定义类的函数(方法),前面可以省略访问修饰符,默认是public public function show(){ //在方法中向访问属性,可以使用$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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