<?php

class Person {

    public $age = 12;

    public function __construct() {

        echo 'show';

    }

    public function __destruct() {

    }

    // 调用方法

    public function showMe() {

        $this->age += 20;

    }

}

// 子类继承父类

class Student extends Person {

    /* (non-PHPdoc)

     * @see Person::showMe()

     */

    public function showMe() {

        $this->age += 100;

    }

}

//初始化对象

$per = new Person();

echo '<br />';

echo $per->age;

echo '<br />';

//调用方法

$per->showMe();

echo $per->age;

echo '<br />';

?>