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php设计模式 Singleton(单例模式)

PHP 2014-12-28 19:12:04 转载来源: 网络整理/侵权必删

本文为大家提供的是php设计模式 中的Singleton(单例模式)示例代码,感兴趣的同学参考下。 保证一个类仅有一个实例,并提供一个访问它的全局访问点 <?php /** * 单例模式 * * 保证一个类仅有一个实例,并提供一个访问它的全局访问点 * */ class Singleton { static private $_instance = null; private function __construct() { } static public function getInstance() { if(is_null(self::$_instance)) { self::$_instance = new Singleton(); } return self::$_instance; } public function display() { echo "it is a singlton class function"; } } // $obj = new Singlet

本文为大家提供的是php设计模式 中的Singleton(单例模式)示例代码,感兴趣的同学参考下。

保证一个类仅有一个实例,并提供一个访问它的全局访问点


<?php
/**
* 单例模式
*
* 保证一个类仅有一个实例,并提供一个访问它的全局访问点
*
*/
class Singleton
{
static private $_instance = null;

private function __construct()
{
}

static public function getInstance()
{
if(is_null(self::$_instance)) {
self::$_instance = new Singleton();
}
return self::$_instance;
}

public function display()
{
echo "it is a singlton class function";
}
}

// $obj = new Singleton(); // 声明不能成功
$obj = Singleton::getInstance();
var_dump($obj);
$obj->display();

$obj1 = Singleton::getInstance();
var_dump(($obj === $obj1));

标签: php 设计模式 Singleton 单例 模式


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