Strategy Pattern

coffee.php

<?php

interface Coffee
{
    public function make();
}

class Cappuccino implements Coffee
{
    public function make()
    {
       var_dump("this is cappuccino..");
    }
}

class Latte implements Coffee
{
    public function make()
    {
        var_dump("this is hazel nut latte..");
    }
}

class BlackCoffee implements Coffee
{

    public function make()
    {
        var_dump("this is black coffee..");
    }
}

class Application
{
    public function makeCoffee(Coffee $coffee)
    {
        return $coffee->make();
    }
}


$app = new Application();
$app->makeCoffee(new Latte());
$app->makeCoffee(new Cappuccino());
$app->makeCoffee(new BlackCoffee());

logger.php

<?php

interface Logger
{
    public function log($data);
}

class DatabaseLogger implements Logger
{
    public function log($data)
    {
        var_dump("this is database log");
        var_dump($data);
    }
}

class FileLogger implements Logger
{
    public function log($data)
    {
        var_dump("this is file log");
        var_dump($data);
    }
}

class WebServiceLogger implements Logger
{
    public function log($data)
    {
        var_dump("this is web service log");
        var_dump($data);
    }
}

class Application
{
    public function log($data, Logger $logger = null)
    {
        $logger = $logger ?: new ConsoleLogger();

        return $logger->log($data);
    }
}


$app = new Application();
$app->log("log data", new FileLogger());