subject.php

См. документацию.

<?php

namespace Bitrix\Socialnetwork\Helper\Workgroup;
 
use Bitrix\Socialnetwork\WorkgroupSubjectTable;
 
class Subject
{
    public static function getName(int $subjectId = 0): string
    {
        $result = '';
        if ($subjectId <= 0)
        {
            return $result;
        }
 
        $res = WorkgroupSubjectTable::getList([
            'filter' => [
                '=ID' => $subjectId,
            ],
            'select' => [
                'NAME'
            ],
        ]);
 
        if ($subjectFields = $res->fetch())
        {
            $result = $subjectFields['NAME'];
        }
 
        return $result;
    }
}