2.3. Composite¶

1چ<?php
2
3// Component interface
4interface Product
5{
6    public function getName(): string;
7
8    public function getPrice(): float;
9}

 1<?php
 2
 3// Composite class
 4class ProductCatalog implements Product
 5{
 6    private array $products = [];
 7
 8    public function addProduct(Product $product)
 9    {
10        $this->products[] = $product;
11    }
12
13    public function getName(): string
14    {
15        return "Product Catalog";
16    }
17
18    public function getPrice(): float
19    {
20        $totalPrice = 0;
21
22        foreach ($this->products as $product) {
23            $totalPrice += $product->getPrice();
24        }
25
26        return $totalPrice;
27    }
28}

 1<?php
 2
 3// Leaf classes
 4class Book implements Product
 5{
 6    private string $name;
 7    private float $price;
 8
 9    public function __construct(string $name, float $price)
10    {
11        $this->name = $name;
12        $this->price = $price;
13    }
14
15    public function getName(): string
16    {
17        return $this->name;
18    }
19
20    public function getPrice(): float
21    {
22        return $this->price;
23    }
24}
25
26class Gadget implements Product
27{
28    private string $name;
29    private float $price;
30
31    public function __construct(string $name, float $price)
32    {
33        $this->name = $name;
34        $this->price = $price;
35    }
36
37    public function getName(): string
38    {
39        return $this->name;
40    }
41
42    public function getPrice(): float
43    {
44        return $this->price;
45    }
46}
47
48class Movie implements Product
49{
50    private string $name;
51    private float $price;
52
53    public function __construct(string $name, float $price)
54    {
55        $this->name = $name;
56        $this->price = $price;
57    }
58
59    public function getName(): string
60    {
61        return $this->name;
62    }
63
64    public function getPrice(): float
65    {
66        return $this->price;
67    }
68}
69
70class Song implements Product
71{
72    private string $name;
73    private float $price;
74
75    public function __construct(string $name, float $price)
76    {
77        $this->name = $name;
78        $this->price = $price;
79    }
80
81    public function getName(): string
82    {
83        return $this->name;
84    }
85
86    public function getPrice(): float
87    {
88        return $this->price;
89    }
90}

 1<?php
 2
 3// Usage example
 4$book = new Book("The Hitchhiker's Guide to the Galaxy", 10.99);
 5$gadget = new Gadget("Wireless Headphones", 79.99);
 6$movie = new Movie("Inception", 7.99);
 7$song = new Song("Bohemian Rhapsody", 0.99);
 8
 9$catalog = new ProductCatalog();
10$catalog->addProduct($book);
11$catalog->addProduct($gadget);
12$catalog->addProduct($movie);
13$catalog->addProduct($song);
14
15echo $catalog->getName() . "\n";
16echo "Total price: $" . $catalog->getPrice();