PHP object-oriented basic concept example tutorial
This article mainly introduces the basic concepts of the PHP introductory tutorialObject-oriented, and briefly analyzes the definition of classes, object creation, and Constructor, member variables, Member method, etc. Friends in need can refer to The examples in this article describe the basic concepts of PHP object-oriented. Share it with everyone for your reference, the details are as follows:
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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