悠悠楠杉
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PHP面向对象中单例模式
12/29
<?php
class Single
{
public $rand;
public static $ob;
//final 方法不能被子类重写，实现单例模式
final protected function __construct()
{
$this->rand = mt_rand(1000, 9999);
}
public static function getins()
{
if (Single::$ob == null) {
Single::$ob = new Single();
}
return Single::$ob;
}
}
var_dump(Single::getins());
var_dump(Single::getins());
