CAllCrmCompany::isMyCompany

static function isMyCompany(int $id)
{
	if ($id <= 0)
	{
		return false;
	}

	static $cache = [];

	if (!isset($cache[$id]))
	{
		$result = \CCrmCompany::GetListEx(
			[],
			['=ID' => $id, 'CHECK_PERMISSIONS' => 'N'],
			false,
			false,
			['IS_MY_COMPANY']
		)->Fetch();

		$cache[$id] = ($result && $result['IS_MY_COMPANY'] === 'Y');
	}

	return $cache[$id];
}