Fluent interface

fluent.php

<?php

interface CaffeineOptionInterface {

    /**
     * @return MilkOptionInterface
     */
    public function decaff();

    /**
     * @return MilkOptionInterface
     */
    public function regular();
}

interface MilkOptionInterface {

    /**
     * @param double $ratio
     * @return SugarOptionInterface
     */
    public function withMilk($ratio);

    /**
     * @return SugarOptionInterface
     */
    public function black();
}

interface SugarOptionInterface {

    /**
     * @param $cubes
     * @return BrewerInterface
     */
    public function withSugars($cubes);

    /**
     * @return BrewerInterface
     */
    public function bitter();

}

interface BrewerInterface {

    /**
     * @return Coffee
     */
    public function brew();

}

class CaffeineOption implements CaffeineOptionInterface
{

    /**
     * @return MilkOptionInterface
     */
    public function decaff()
    {
        echo "\n-decaff";

        return new MilkOption();
    }

    /**
     * @return MilkOptionInterface
     */
    public function regular()
    {
        echo "\n-regular";

        return new MilkOption();
    }
}

class MilkOption implements MilkOptionInterface
{
    public function withMilk($ratio)
    {
        echo "\n-withMilk($ratio)";

        return new SugarOption();

    }

    public function black()
    {
        echo "\n-black";

        return new SugarOption();
    }
}

class SugarOption implements SugarOptionInterface
{

    /**
     * @param $cubes
     * @return BrewerInterface
     */
    public function withSugars($cubes)
    {
        echo "\n-withSugar($cubes)";

        return new Brewer();
    }

    /**
     * @return BrewerInterface
     */
    public function bitter()
    {
        echo "\n-bitter";

        return new Brewer();
    }
}

class Brewer implements BrewerInterface
{
    /**
     * @return Coffee
     */
    public function brew()
    {
        echo "\n-brew\n";

        return new Coffee();
    }
}

class Coffee
{
    public function __construct()
    {
    }
}

class CoffeeMaker
{
    /**
     * @return CaffeineOption
     */
    public function prepare()
    {
        return new CaffeineOption();
    }
}

echo "Preparing sweet coffee";
$myCoffee = (new CoffeeMaker())
    ->prepare()
    ->decaff()
    ->withMilk(10)
    ->withSugars(2)
    ->brew();


echo "\nPreparing black coffee";
$myCoffee = (new CoffeeMaker())
    ->prepare()
    ->regular()
    ->black()
    ->bitter()
    ->brew();

hasCaffeine = false; return $this; } /** * @return MilkOptionInterface */ public function regular() { $this->hasCaffeine = true; return $this; } /** * @param $ratio * @return SugarOptionInterface */ public function withMilk($ratio) { $this->milkOption = $ratio; return $this; } /** * @return SugarOptionInterface */ public function black() { $this->milkOption = 0; return $this; } /** * @param $cubes * @return BrewerInterface */ public function withSugars($cubes) { $this->sugar = $cubes; return $this; } /** * @return BrewerInterface */ public function bitter() { $this->sugar = 0; return $this; } /** * @return Coffee */ public function brew() { return new Coffee($this->milkOption, $this->sugar, $this->hasCaffeine); } ``` } $myCoffee = (new CoffeeMaker()) ->prepare() ->decaff() ->withMilk(1) ->bitter() ->brew();