本文为demo，更详情请查看​​这里​​

电脑有键盘，比方：雷蛇，双飞燕。

有时候使用双飞燕，有时候雷蛇

这两个统称为键盘，所以写一个接口类

interface Board
{
    
    public function attr();//键盘的属性

}

创建两个类：

LeiShe.php

<?php


namespace App\Services\Test\board;


use App\Services\Test\Board;

class LeiShe implements Board
{
    public $attr='雷蛇键盘';

    public function attr()
    {
       return $this->attr;
    }
}

ShuangFeiYan.php

<?php


namespace App\Services\Test\board;


use App\Services\Test\Board;

class ShuangFeiYan implements Board
{

    public $attr='双飞燕键盘';

    public function attr()
    {
        return $this->attr;
    }
}

创建 Provider

php artisan make:provider TestService

在 app/Providers
生成：TestServiceProvider.php

<?php

namespace App\Providers;

use App\Services\Test\Computer;
use Illuminate\Support\ServiceProvider;

class TestServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {

        $this->app->singleton('LeiShe','App\Services\Test\board\LeiShe');//雷蛇
        $this->app->bind('ShuangFeiYan','App\Services\Test\board\ShuangFeiYan');//双飞燕
    }

    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }
}

现在你可以在程序中使用

echo app('LeiShe')->attr();

singleton实现的是单例模式；

bind： new 对象

其他扩展：
Computer.phlp

<?php


namespace App\Services\Test;


class Computer
{
    /**
     * @var
     */
    public $board;

    function __construct(Board $board)
    {
        $this->board = $board;
    }

    public function attr(){

        return $this->board->attr();

    }
}

提供者：

class TestServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {

        $this->app->singleton('LeiShe','App\Services\Test\board\LeiShe');//雷蛇
        $this->app->singleton('ShuangFeiYan','App\Services\Test\board\ShuangFeiYan');//双飞燕

        //触发事件
        $this->app->resolving('ShuangFeiYan',function ($object, $container){
            $object->memo = '初始化的值';
            $leishe = $container->make('LeiShe');
            $leishe->memo = '初始化雷蛇的默认值';
        });

        $this->app->bind('Computer',function ($container){
            return new Computer($container->make('ShuangFeiYan'));//使用双飞燕键盘
        });



    }

​​和我做朋友？​​