rowtype.php

<?php
 
namespace Bitrix\Iblock\Grid;
 
use Bitrix\Main\SystemException;
 
class RowType
{
    public const ELEMENT = 'E';
    public const SECTION = 'S';
 
    public static function getIndex(string $type, string|int $id): string
    {
        return ($type === self::SECTION ? self::SECTION : self::ELEMENT) . $id;
    }
 
    public static function parseIndex(string $index): ?array
    {
        $re = '/^(E|S|)(\d+)$/';
        if (preg_match($re, $index, $m))
        {
            $type = ($m[1] ?: RowType::ELEMENT);
            $index = (int)$m[2];
 
            return [$type, $index];
        }
        elseif (is_numeric($index))
        {
            return [RowType::ELEMENT, (int)$index];
        }
 
        return null;
    }
 
    public static function parseIndexList(array $ids): array
    {
        $elementIds = [];
        $sectionIds = [];
 
        foreach ($ids as $id)
        {
            $index = self::parseIndex($id);
            if ($index === null)
            {
                continue;
            }
            [$type, $id] = $index;
 
            if ($type === self::ELEMENT)
            {
                $elementIds[] = $id;
            }
            else
            {
                $sectionIds[] = $id;
            }
        }
 
        return [$elementIds, $sectionIds];
    }
}