Registry.php

См. документацию.

<?php
 
namespace Bitrix\Im\V2;

class Registry extends \ArrayObject
{
    public function unsetByKeys(array $keys): void
    {
        foreach ($keys as $key)
        {
            unset($this[$key]);
        }
    }

    public function mergeRegistry(Registry $registry): self
    {
        foreach ($registry as $item)
        {
            $this[] = $item;
        }
 
        return $this;
    }

    public function filter(callable $predicate): self
    {
        $newCollection = clone $this;
        $keyToUnset = [];
 
        foreach ($newCollection as $key => $item)
        {
            if (!$predicate($item))
            {
                $keyToUnset[] = $key;
            }
        }
 
        foreach ($keyToUnset as $key)
        {
            unset($newCollection[$key]);
        }
 
        return $newCollection;
    }

    public function getAny()
    {
        foreach ($this as $item)
        {
            return $item;
        }
 
        return null;
    }
 
    public function isEmpty(): bool
    {
        return $this->count() === 0;
    }
}