Decorator design pattern in PHP

This is a simple implementation of the decorator design pattern in PHP.

Installation and run

1. Clone this repository
2. Run composer install
3. Run php src/main.php

UML diagram

classDiagram
    BanhMi --|>BanhMiInterface
    BanhMiDecorator --|> BanhMiInterface
    DuaLeo --|> BanhMiDecorator
    ChaLua --|> BanhMiDecorator
    TuongOt --|> BanhMiDecorator
    Thit --|> BanhMiDecorator

    class BanhMi {
        +Cost() float
    }

    class BanhMiInterface {
        +Cost() float
    }

    class BanhMiDecorator {
        -BanhMiInterface banhMi
        +BanhMiDecorator(BanhMiInterface wrappee)
        +Cost() float
    }

Loading

Usage

$firstBanhMi = new Thit(
                new TuongOt(
                    new DuaLeo(
                        new ChaLua(
                            new BanhMi()))));

echo "Cost of first banh mi: " . $firstBanhMi->cost() . " VND" . PHP_EOL;

$secondBanhMi = new Thit(
                    new TuongOt(
                        new DuaLeo(
                            new BanhMi()
                        )
                    )
                );

echo "Cost of second banh mi: " . $secondBanhMi->cost() . " VND" . PHP_EOL;

Output

Cost of first banh mi: 12000 VND
Cost of second banh mi: 9500 VND