摘要：<?phpclass Hubby{private function __construct() {}private function __clone() {}protected static $instance = null;public static function getInstance(){if(is_null(static::$instance)) {static::$instan

<?php

class Hubby

{

private function __construct() {}

private function __clone() {}

protected static $instance = null;

public static function getInstance()

{

if(is_null(static::$instance)) {

static::$instance = new static();

}

return static::$instance;

}

}

$hubby1 = Hubby::getInstance();

$hubby1 = Hubby::getInstance();

echo ($hubby1 instanceof Hubby)?'是':'不是';

echo '<br>';

echo ($hubby2 instanceof Hubby)?'是':'不是';

批改老師：查無此人批改時(shí)間：2019-06-10 09:09:56
老師總結(jié)：完成的不錯(cuò)。編程有很多設(shè)計(jì)模式，多了解，對(duì)以后工作幫助很大。繼續(xù)加油。