php之类与继承

代码块
Test.php

<?php
/**
 * Class Test
 * 类的实例化
 * 类的静态属性和静态方法
 */
class Test{
//    抽象属性
    private $name;
    public static $username = '汤唯';
    public function __construct($name,$username){
        $this->name=$name;
        self::$username=$username;
    }
    public function hello(){
        echo "hello".$this->name."<hr>";
    }
    public static function hi(){
        return "333<hr>";
    }
}
Test::$username='321';
$hello = new Test('miejue','汤唯');
$hello->hello();
echo Test::hi();

autoload.php

<?php
/**
 * 类的自动加载
 */
spl_autoload_register(function ($class){
    require $class.'.php';
});

Extend.php

<?php
/**
 * 类的继承
 * 类方法的重写
 * 类方法的扩展
 */
require 'autoload.php';
class Extend extends Test
{
    public function __construct($a, $b)
    {
        parent::__construct($a, $b);
    }
    public function haha(){
        echo '123'."<hr>";
    }
}
$haha = new Extend('3','2');
$haha->haha();
$haha->hello();
var_dump($haha instanceof Test);

效果

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