abstract：<?php class Hubby{private function __construct() {}private function __clone() {}protected static $instance = null; public static function getInstance() { if (is_null(static::$instance)) { s
<?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();
$hubby2 = Hubby::getInstance();
echo ($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);
Correcting teacher：查无此人Correction time：2019-06-05 09:19:27
Teacher's summary：完成的不错，学习完类，就相当于php入门了。继续加油。