单例模式

<?php

//单例模式
class Singleton
{

    private static $instance = null;

    private function __construct()
    {
        echo "我不能被实例化******";
    }

    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function getName($name)
    {

        echo "this is getName Test " . $name . "<br>";
    }
}

$obj = Singleton::getInstance();
$obj->getName(‘F‘);
$obj = Singleton::getInstance();
$obj->getName(‘S‘);

class Normal
{

    public function __construct()
    {
        echo "normal __ construct-----";
    }

    public function getName($name)
    {
        echo " this is normal getname " . $name . "<br>";
    }
}

$normalObj = new Normal();
$normalObj->getName(‘F‘);
$normalObj = new Normal();
$normalObj->getName(‘S‘);