Adapter design pattern Php

We start with class Adaptee. The Adaptee has a message that we can't *currently* read.

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

Next we move to our Target class, which we need to create. We create the Target class with the following code:

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

Next we move to the Adapter. The Adapter will do the translation for use using the strrev utility. We create the Adapter class which will be extended by Target.

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());
    }
}

Now let's put this all together in the index.php file. We start by listiing our includes files we just created.

include_once ('Target.php');
include_once ('Adaptee.php');
include_once ('Adapter.php');

The client code supports all classes that follow the Target interface.

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


echo "Client: I can work just fine with the Target objects:<br/>";
$target = new Target;

clientCode($target);

echo "<br/><br/>";

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

echo "Client: But I can work with it via the Adapter:<br/>";
$adapter = new Adapter($adaptee);
clientCode($adapter);

echo "<br/><br/>";

Now if we view our code trough a browser we should see:

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.

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