filter.php

См. документацию.

<?php
 
namespace Bitrix\Translate;

class Filter implements \Iterator, \Countable, \Serializable, \ArrayAccess
{
    const STORAGE_NAME = 'TRANSLATE_FILTER';
    const STORAGE_TAB_CNT = 'TRANSLATE_FILTER_TAB';
 
    private array $params = [];
 
    private array $iterateCodes = [];
 
    private int $iteratePosition = 0;
 

    public function __construct($param = null)
    {
        if (\is_array($param))
        {
            $this->params = $param;
        }
        elseif (\is_int($param) && (int)$param > 0)
        {
            $this->restore((int)$param);
        }
    }
 
    //region getter/setter

    public function __isset($code)
    {
        return isset($this->params[$code]);
    }

    public function __get($code)
    {
        return $this->params[$code] ?: null;
    }

    public function __set($code, $value)
    {
        $this->params[$code] = $value;
        $this->iterateCodes[] = $code;
    }

    public function __unset($code)
    {
        if (isset($this->params[$code]))
        {
            unset($this->params[$code]);
            $this->iterateCodes = \array_keys($this->params);
        }
    }
 
    //endregion
 
    //region Iterator

    #[\ReturnTypeWillChange]
    public function current()
    {
        $code = $this->iterateCodes[$this->iteratePosition];
 
        return $this->params[$code] ?: null;
    }

    public function next(): void
    {
        ++ $this->iteratePosition;
    }

    #[\ReturnTypeWillChange]
    public function key()
    {
        return $this->iterateCodes[$this->iteratePosition] ?: null;
    }

    public function valid(): bool
    {
        return isset($this->iterateCodes[$this->iteratePosition], $this->params[$this->iterateCodes[$this->iteratePosition]]);
    }

    public function rewind(): void
    {
        $this->iteratePosition = 0;
        $this->iterateCodes = \array_keys($this->params);
    }
 
    //endregion
 
    // region Serializable

    public function serialize(): string
    {
        return \serialize($this->params);
    }

    public function unserialize($data): void
    {
        if (!empty($data))
        {
            $deserialized = \unserialize($data, ['allowed_classes' => false]);
            if (\is_array($deserialized))
            {
                $this->params = $deserialized;
            }
        }
    }
 
    //endregion
 
    // region Storage

    public static function getTabId(bool $increment = true): int
    {
        $tabId = 0;
        if (isset($_SESSION[self::STORAGE_TAB_CNT]))
        {
            $tabId = $_SESSION[self::STORAGE_TAB_CNT];
        }
        if ($increment)
        {
            $tabId ++;
            $_SESSION[self::STORAGE_TAB_CNT] = $tabId;
        }
 
        return $tabId;
    }
 

    public function store(): void
    {
        if (!isset($_SESSION[self::STORAGE_NAME]))
        {
            $_SESSION[self::STORAGE_NAME] = [];
        }
        if (!isset($this->tabId))
        {
            $this->tabId = self::getTabId();
        }
 
        $_SESSION[self::STORAGE_NAME][$this->tabId] = $this->serialize();
    }

    public function restore(int $id): void
    {
        if (isset($_SESSION[self::STORAGE_NAME], $_SESSION[self::STORAGE_NAME][$id]))
        {
            $this->unserialize($_SESSION[self::STORAGE_NAME][$id]);
        }
        $this->tabId = $id;
    }
 
    // endregion
 
    //region ArrayAccess

    public function offsetExists($code): bool
    {
        return isset($this->params[$code]);
    }

    #[\ReturnTypeWillChange]
    public function offsetGet($code)
    {
        if (isset($this->params[$code]))
        {
            return $this->params[$code];
        }
 
        return null;
    }

    public function offsetSet($code, $param): void
    {
        $this->params[$code] = $param;
    }

    public function offsetUnset($code): void
    {
        if (isset($this->params[$code]))
        {
            unset($this->params[$code]);
        }
    }
 
    // endregion
 
    //region Countable

    public function count(): int
    {
        return \is_array($this->params) ? \count($this->params) : 0;
    }
 
    //endregion
}