延迟加载static

<?php/** * Created by PhpStorm. * User: siyu.wang * Date: 2017/10/9 * Time: 10:15 *///面向对象延迟加载staticclass Person{    static $name = 'aa';    const AGE = 18;    public static function intro(){        echo 'my name is '.self::$name.'<br/>';        echo 'my age is '.self::AGE.'<br/>';    }    public static function intro1(){        echo 'my name is '.static::$name.'<br/>';        echo 'my age is '.static::AGE.'<br/>';    }}class Stu extends Person{    static $name = 'bb';    const AGE = 19;    public static function intro(){        echo 'my name is '.self::$name.'<br/>';        echo 'my age is '.self::AGE.'<br/>';    }}person::intro();echo '<br/>';person::intro1();echo '<br/>';Stu::intro();echo '<br/>';Stu::intro1();