collection.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Discount\Gift;
 
 
use Bitrix\Main\Type\Dictionary;
 
class Collection extends Dictionary
{
    public const TYPE_GRANT_ALL = 'all';
    public const TYPE_GRANT_ONE = 'one';
 
    protected $type = self::TYPE_GRANT_ONE;

    public function __construct(array $gifts, $type)
    {
        $this->type = $type;
 
        parent::__construct($gifts);
    }
 
    protected function setGift(Gift $gift, $offset = null)
    {
        parent::offsetSet($offset, $gift);
    }
 
    public function offsetSet($offset, $value)
    {
        $this->setGift($value, $offset);
    }
 
    public function getGrantType(): string
    {
        return $this->type;
    }
}