축약 함수

1public function instance($instance = null)
2{
3    $instance = $instance ?: self::DEFAULT_INSTANCE;
4    $this->instance = sprintf('%s.%s', 'cart', $instance);
5    return $this;
6}

배열인지 확인하기

 1if ($this->isMulti($id)) {
 2    return array_map(function ($item) {
 3        return $this->add($item);
 4    }, $id);
 5}
 6 
 7array_map( 함수(배열값), 배열);
 8 
 9/**
10* Check if the item is a multidimensional array or an array of Buyables.
11*
12* @param mixed $item
13* @return bool
14*/
15private function isMulti($item)
16{
17    if (!is_array($item)) return false;
18    return is_array(head($item)) || head($item) instanceof Buyable;
19}
20 
21is_array()
22head() 이 함수는 뭐지?

세션 확인하기

 1protected function getContent()
 2{
 3    $content = $this->session->has($this->instance)
 4        ? $this->session->get($this->instance)
 5        : new Collection;
 6    return $content;
 7}
 8 
 9session->has();
10session->get();

1public function get($rowId)
2{
3    $content = $this->getContent();
4    if (!$content->has($rowId))
5        throw new InvalidRowIDException("The cart does not contain rowId {$rowId}.");
6    return $content->get($rowId);
7}

Class 자신이 갖고 있는 static 함수를 이용해서 직접 생성하는 방벙

 1 
 2 public function __construct($id, $name, $price, array $options = [])
 3 {
 4     if(empty($id)) {
 5         throw new \InvalidArgumentException('Please supply a valid identifier.');
 6     }
 7     if(empty($name)) {
 8         throw new \InvalidArgumentException('Please supply a valid name.');
 9     }
10     if(strlen($price) < 0 || ! is_numeric($price)) {
11         throw new \InvalidArgumentException('Please supply a valid price.');
12     }
13     $this->id       = $id;
14     $this->name     = $name;
15     $this->price    = floatval($price);
16     $this->options  = new CartItemOptions($options);
17     $this->rowId = $this->generateRowId($id, $options);
18 }
19 
20 /**
21 * Create a new instance from the given array.
22 *
23 * @param array $attributes
24 * @return \App\CartItem
25 */
26 use Illuminate\Support\Arr;
27 
28 public static function fromArray(array $attributes)
29 {
30     $options = Arr::get($attributes, 'options', []);
31     return new self($attributes['id'], $attributes['name'], $attributes['price'], $options);
32 }
33 
34/**
35 * Create a new instance from the given attributes.
36 *
37 * @param int|string $id
38 * @param string     $name
39 * @param float      $price
40 * @param array      $options
41 * @return \App\CartItem
42 */
43public static function fromAttributes($id, $name, $price, array $options = [])
44{
45    return new self($id, $name, $price, $options);
46}

Generate a unique id for the cart item.

1protected function generateRowId($id, array $options)
2{
3    ksort($options);
4    return md5($id . serialize($options));
5}

배열 클래스 만들기

 1namespace App;
 2 
 3use Illuminate\Support\Collection;
 4 
 5class CartItemOptions extends Collection
 6{
 7    /**
 8        * Get the option by the given key.
 9        *
10        * @param string $key
11        * @return mixed
12        */
13    public function __get($key)
14    {
15        return $this->get($key);
16    }
17}