摘要：<?php class Hubby { private function __construct(){} private function __clone(){} protected static $instance = null;
<?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;
}
}
// 从外部来实例化Hubby类
$hubby1 = Hubby::getInstance();
$hubby2 = Hubby::getInstance();
echo($hubby1 instanceof Hubby)? '是':'不是';
echo '<br>';
echo($hubby2 instanceof Hubby)? '是':'不是';
echo '<br>';
echo ($hubby1 === $hubby2) ? '完全相等' : '不相等';
echo '<br>';
var_dump($hubby1,$hubby2);
批改老师：天蓬老师批改时间：2019-01-10 16:40:55
老师总结：js是天生的单例模式, 不过,单例还是很有用的, 不是吗? php, java都有
