updatecontactdtocollection.php

См. документацию.

<?php
 
namespace Bitrix\Sender\Internals\Dto;

class UpdateContactDtoCollection
{
    private array $items = [];

    public function append(UpdateContact $item): self {
        $this->items[] = $item;
        return $this;
    }

    public function all(): array {
        return $this->items;
    }

    public function toArray(): array {
        return array_map(fn(UpdateContact $item) => $item->toArray(), $this->items);
    }

    public function getOnDuplicateKeyUpdateFields()
    {
        $item = $this->items[0] ?? null;
 
        if (!$item)
        {
            return [];
        }
 
        return $item->getOnDuplicateKeyUpdateFields();
    }

    public function count(): int {
        return count($this->items);
    }
}