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 &#39;<br/>&#39;;
  var_dump($computer1);
?>

Demo2.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
// class Computer {
//   //字段成员的声明格式：修饰符 变量名 [=xxx];
//   public $_name = &#39;联想&#39;;  //public 表示共有，类外可以访问
//   public $_model = &#39;i7&#39;;
// }
// //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 = &#39;dell&#39;;
// 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 = &#39;联想&#39;;
  //取值
  echo $computer1 -> _name;
?>

Demo3.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  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 &#39;我是运行的方法&#39;;
    }
  }
  //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(&#39;Content-Type:text/html; charset=utf-8;&#39;);
// class Computer {
//   //字段成员的声明格式：修饰符 变量名 [=xxx];
//   public $_name = &#39;联想&#39;;  //public 表示共有，类外可以访问
//   public $_model = &#39;i7&#39;;
// }
// //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 = &#39;dell&#39;;
// 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 = &#39;联想&#39;;
  //取值
  //echo $computer1 -> _name;
  $computer2 = $computer1;
  echo $computer2 -> _name;
?>

Demo5.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  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.&#39;是运行的方法&#39;;
    }
  }
  //创建一个对象，生产出一台电脑 -> 表示指向
  $computer1 = new Computer();
  $computer1 -> _run(&#39;一站式建网站&#39;);
?>

Demo6.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  class Computer {
    //创建一个构造方法
    public function Computer(){
      echo &#39;我是构造方法&#39;;
    }
  }
  //只要实例化，就可以运行构造方法
  //$computer = new Computer();
  new Computer();
?>

Demo7.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  class Computer {
    //创建一个构造方法
    public function __construct(){
      echo &#39;我是比较先进的构造方法&#39;;
    }
  }
  //只要实例化，就可以运行构造方法
  //$computer = new Computer();
  new Computer();
?>

Demo8.php

<?php
  header(&#39;Content-Type:text/html; charset=utf-8;&#39;);
  class Computer {
    //创建一个构造方法
    public function __construct(){
      echo &#39;我是比较先进的构造方法&#39;;
    }
    //析构方法
    public function __destruct(){
      echo &#39;我是析构方法&#39;;
    }
    //普通方法
    public function _run(){
      echo &#39;我是普通方法&#39;;
    }
  }
  //只要实例化，就可以运行构造方法
  $computer = new Computer();
  $computer -> _run();
?>

##Summary: That’s it The entire content of this article is hoped to be helpful to everyone's study.

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