EntityCollectionInterface.php

См. документацию.

<?php
 
declare(strict_types=1);
 
namespace Bitrix\Main\Entity;
 
use Bitrix\Main\ArgumentException;
 
interface EntityCollectionInterface extends \Countable, \IteratorAggregate
{
    public function add(EntityInterface $item): void;
 
    public function isEmpty(): bool;
 
    public function find(callable $callback): ?EntityInterface;
 
    public function filter(callable $callback): static;

    public function map(callable $callback): array;
}