详述PHP适配器模式（附代码示例）

<?php

namespace RefactoringGuru\Adapter\RealWorld;


interface Notification
{
    public function send(string $title, string $message);
}


class EmailNotification implements Notification
{
    private $adminEmail;

    public function __construct(string $adminEmail)
    {
        $this->adminEmail = $adminEmail;
    }

    public function send(string $title, string $message): void
    {
        mail($this->adminEmail, $title, $message);
        echo "Sent email with title '$title' to '{$this->adminEmail}' that says '$message'.";
    }
}


class SlackApi
{
    private $login;
    private $apiKey;

    public function __construct(string $login, string $apiKey)
    {
        $this->login = $login;
        $this->apiKey = $apiKey;
    }

    public function logIn(): void
    {
        // Send authentication request to Slack web service.
        echo "Logged in to a slack account '{$this->login}'.\n";
    }

    public function sendMessage(string $chatId, string $message): void
    {
        // Send message post request to Slack web service.
        echo "Posted following message into the '$chatId' chat: '$message'.\n";
    }
}


class SlackNotification implements Notification
{
    private $slack;
    private $chatId;

    public function __construct(SlackApi $slack, string $chatId)
    {
        $this->slack = $slack;
        $this->chatId = $chatId;
    }

    
    public function send(string $title, string $message): void
    {
        $slackMessage = "#" . $title . "# " . strip_tags($message);
        $this->slack->logIn();
        $this->slack->sendMessage($this->chatId, $slackMessage);
    }
}


function clientCode(Notification $notification)
{
    // ...

    echo $notification->send("Website is down!",
        "<strong style='color:red;font-size: 50px;'>Alert!</strong> " .
        "Our website is not responding. Call admins and bring it up!");

    // ...
}

echo "Client code is designed correctly and works with email notifications:\n";
$notification = new EmailNotification("developers@example.com");
clientCode($notification);
echo "\n\n";


echo "The same client code can work with other classes via adapter:\n";
$slackApi = new SlackApi("example.com", "XXXXXXXX");
$notification = new SlackNotification($slackApi, "Example.com Developers");
clientCode($notification);

Client code is designed correctly and works with email notifications:
Sent email with title 'Website is down!' to 'developers@example.com' that says '<strong style='color:red;font-size: 50px;'>Alert!</strong> Our website is not responding. Call admins and bring it up!'.
The same client code can work with other classes via adapter:
Logged in to a slack account 'example.com'.
Posted following message into the 'Example.com Developers' chat: '#Website is down!# Alert! Our website is not responding. Call admins and bring it up!'.

<?php

namespace RefactoringGuru\Adapter\Conceptual;


class Target
{
    public function request(): string
    {
        return "Target: The default target's behavior.";
    }
}


class Adaptee
{
    public function specificRequest(): string
    {
        return ".eetpadA eht fo roivaheb laicepS";
    }
}


class Adapter extends Target
{
    private $adaptee;

    public function __construct(Adaptee $adaptee)
    {
        $this->adaptee = $adaptee;
    }

    public function request(): string
    {
        return "Adapter: (TRANSLATED) " . strrev($this->adaptee->specificRequest());
    }
}


function clientCode(Target $target)
{
    echo $target->request();
}

echo "Client: I can work just fine with the Target objects:\n";
$target = new Target();
clientCode($target);
echo "\n\n";

$adaptee = new Adaptee();
echo "Client: The Adaptee class has a weird interface. See, I don't understand it:\n";
echo "Adaptee: " . $adaptee->specificRequest();
echo "\n\n";

echo "Client: But I can work with it via the Adapter:\n";
$adapter = new Adapter($adaptee);
clientCode($adapter);

Client: I can work just fine with the Target objects:
Target: The default target's behavior.

Client: The Adaptee class has a weird interface. See, I don't understand it:
Adaptee: .eetpadA eht fo roivaheb laicepS

Client: But I can work with it via the Adapter:
Adapter: (TRANSLATED) Special behavior of the Adaptee.