PHP中的服務容器與依賴註入的思想

<?php

/**

 * 定義了一個消息類

 * Class Message

 */

class  Message{

  public function seed()

  {

      return 'seed email';

  }

}

/*

 * 訂單產生的時候 需要發送消息

 */

class Order{

    protected $messager = '';

    function __construct()

    {

        $this->messager = new Message();

    }

    public function seed_msg()

    {

        return $this->messager->seed();

    }

}

$Order = new Order();

$Order->seed_msg();

<?php

/**

 * 為了約束我們先定義一個消息介面

 * Interface Message

 */

interface  Message{

  public function seed();

}

/**

 * 有一個發送郵件的類

 * Class SeedEmail

 */

class SeedEmail implements Message

{

    public function seed()

    {

        return  'seed email';

        // TODO: Implement seed() method.

    }

}

/**

 *新增一個發送簡訊的類

 * Class SeedSMS

 */

class SeedSMS implements Message

{

    public function seed()

    {

        return 'seed sms';

        // TODO: Implement seed() method.

    }

}

/*

 * 訂單產生的時候 需要發送消息

 */

class Order{

    protected $messager = '';

    function __construct(Message $message)

    {

        $this->messager = $message;

    }

    public function seed_msg()

    {

        return $this->messager->seed();

    }

}

//我們需要發送郵件的時候

$message = new SeedEmail();

//將郵件發送對象作為參數傳遞給Order

$Order = new Order($message);

$Order->seed_msg();

//我們需要發送簡訊的時候

$message = new SeedSMS();

$Order = new Order($message);

$Order->seed_msg();

<?php

/**

 * 為了約束我們先定義一個消息介面

 * Interface Message

 */

interface  Message{

    public function seed();

}

/**

 * 有一個發送郵件的類

 * Class SeedEmail

 */

class SeedEmail implements Message

{

    public function seed()

    {

        return  'seed email';

        // TODO: Implement seed() method.

    }

}

/**

 *新增一個發送簡訊的類

 * Class SeedSMS

 */

class SeedSMS implements Message

{

    public function seed()

    {

        return 'seed sms';

        // TODO: Implement seed() method.

    }

}

/**

 * 這是一個簡單的服務容器

 * Class Container

 */

class Container

{

    protected $binds;

    protected $instances;

    public function bind($abstract, $concrete)

    {

        if ($concrete instanceof Closure) {

            $this->binds[$abstract] = $concrete;

        } else {

            $this->instances[$abstract] = $concrete;

        }

    }

    public function make($abstract, $parameters = [])

    {

        if (isset($this->instances[$abstract])) {

            return $this->instances[$abstract];

        }

        array_unshift($parameters, $this);

        return call_user_func_array($this->binds[$abstract], $parameters);

    }

}

//創建一個消息工廠

$message = new  Container();

//將發送簡訊註冊綁定到工廠裡面

$message->bind('SMS',function (){

     return   new  SeedSMS();

});

//將發送郵件註冊綁定到工廠

$message->bind('EMAIL',function (){

   return new  SeedEmail();

});

//需要發送簡訊的時候

$SMS  = $message->make('SMS');

$SMS->seed();

$sms = new  SeedSMS();

$message->bind('SMS',$sms);