单例-Singleton

单例模式的作用就是保证在整个应用程序的生命周期中，任何一个时刻，
单例类的实例都只存在一个，同时这个类还必须提供一个访问该类的全局访问点。

常见使用实例：数据库连接器；日志记录器（如果有多种用途使用多例模式）；锁定文件。

code

singletonTrait.php

<?php

/**
 * Trait singletonTrait
 */

namespace singleton;

trait singletonTrait
{
    /**
     * @var static
     */
    protected static $instance = null;


    /**
     * MTool_SingletonTrait constructor.
     */
    private function __construct()
    {

    }

    /**
     *  防止被克隆
     */
    private function __clone()
    {

    }

    /**
     *  防止被反序列化
     */
    private function __wakeup()
    {

    }

    /**
     * @return static Singleton
     */
    final public static function instance()
    {
        if (static::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }
}

api.php

<?php
namespace singleton;

include_once('./singletonTrait.php');
/**
 * Class Api
 * @package singleton
 */
class api
{
    use singletonTrait;

    public function __construct()
    {

    }

    public function test()
    {
        echo 'test' . PHP_EOL;
    }
}


echo api::instance()->test();

523 对 “Less Design Patterns”的想法；

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