


Detailed explanation of basic object-oriented concepts and examples of PHP introductory tutorial
This article mainly introduces the basic concepts of object-oriented in PHP introductory tutorial, and briefly analyzes the definition of classes, object creation, constructors, member variables, member methods, etc. involved in PHP object-oriented in the form of examples. What is needed Friends can refer to
Demo1.php
<?php //怎样去创建一个类 格式:修饰符 class 类名{} //我们去创建一个电脑的类,这类可以创建出对象(生产出电脑) class Computer { //类名第一个字母大写 } //创建一台电脑出来,也就是对象的声明 //格式:变量 = new 类名(); //new Compuer() 表示实例化的过程(意思是创建一个对象) //$compuer1 = new Compuer() 这个过程就是把实例化对象的地址给 $compuer1 //$compuer1 我们就可以称作为对象的应用 $computer1 = new Computer(); //这是我们创建的第一台电脑 $computer2 = $computer1; //这是我们创建的第二台电脑 var_dump($computer1); echo '<br/>'; var_dump($computer1); ?>
Demo2.php
<?php header('Content-Type:text/html; charset=utf-8;'); // class Computer { // //字段成员的声明格式:修饰符 变量名 [=xxx]; // public $_name = '联想'; //public 表示共有,类外可以访问 // public $_model = 'i7'; // } // //创建一个对象,生产出一台电脑 -> 表示指向 // $computer1 = new Computer(); // echo $computer1 -> _name; // $computer1 -> _name = 'dell'; // echo $computer1 -> _name; class Computer { //字段成员的声明格式:修饰符 变量名 [=xxx]; public $_name; //public 表示共有,类外可以访问 public $_model; } //创建一个对象,生产出一台电脑 -> 表示指向 $computer1 = new Computer(); //给成员字段赋值 $computer1 -> _name = '联想'; //取值 echo $computer1 -> _name; ?>
Demo3.php
<?php header('Content-Type:text/html; charset=utf-8;'); class Computer { public $_name; //public 表示共有,类外可以访问 public $_model; //创建方法的格式:修饰符 function 方法名(){} //如果不加修饰符,默认就是public function _run(){ echo '我是运行的方法'; } } //创建一个对象,生产出一台电脑 -> 表示指向 $computer1 = new Computer(); $computer1 -> _run(); ?>
Demo4.php
<?php header('Content-Type:text/html; charset=utf-8;'); // class Computer { // //字段成员的声明格式:修饰符 变量名 [=xxx]; // public $_name = '联想'; //public 表示共有,类外可以访问 // public $_model = 'i7'; // } // //创建一个对象,生产出一台电脑 -> 表示指向 // $computer1 = new Computer(); // echo $computer1 -> _name; // $computer1 -> _name = 'dell'; // echo $computer1 -> _name; class Computer { //字段成员的声明格式:修饰符 变量名 [=xxx]; public $_name; //public 表示共有,类外可以访问 public $_model; } //创建一个对象,生产出一台电脑 -> 表示指向 $computer1 = new Computer(); //给成员字段赋值 $computer1 -> _name = '联想'; //取值 //echo $computer1 -> _name; $computer2 = $computer1; echo $computer2 -> _name; ?>
Demo5.php
<?php header('Content-Type:text/html; charset=utf-8;'); class Computer { public $_name; //public 表示共有,类外可以访问 public $_model; //创建方法的格式:修饰符 function 方法名(){} //如果不加修饰符,默认就是public function _run($_who){ echo $_who.'是运行的方法'; } } //创建一个对象,生产出一台电脑 -> 表示指向 $computer1 = new Computer(); $computer1 -> _run('一站式建网站'); ?>
Demo6.php
<?php header('Content-Type:text/html; charset=utf-8;'); class Computer { //创建一个构造方法 public function Computer(){ echo '我是构造方法'; } } //只要实例化,就可以运行构造方法 //$computer = new Computer(); new Computer(); ?>
Demo7.php
<?php header('Content-Type:text/html; charset=utf-8;'); class Computer { //创建一个构造方法 public function __construct(){ echo '我是比较先进的构造方法'; } } //只要实例化,就可以运行构造方法 //$computer = new Computer(); new Computer(); ?>
Demo8.php
<?php header('Content-Type:text/html; charset=utf-8;'); class Computer { //创建一个构造方法 public function __construct(){ echo '我是比较先进的构造方法'; } //析构方法 public function __destruct(){ echo '我是析构方法'; } //普通方法 public function _run(){ echo '我是普通方法'; } } //只要实例化,就可以运行构造方法 $computer = new Computer(); $computer -> _run(); ?>
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