SaveOrderAction::searchExistingUser

private function searchExistingUser(string $email, string $phone): ?int
{
	$existingUserId = null;

	if (!empty($email))
	{
		$res = MainUserTable::getRow([
			'filter' => [
				'=ACTIVE' => 'Y',
				'=EMAIL' => $email,
			],
			'select' => ['ID'],
		]);
		if (isset($res['ID']))
		{
			$existingUserId = (int)$res['ID'];
		}
	}

	if (!$existingUserId && !empty($phone))
	{
		$normalizedPhone = NormalizePhone($phone);
		$normalizedPhoneForRegistration = MainUserPhoneAuthTable::normalizePhoneNumber($phone);

		if (!empty($normalizedPhone))
		{
			$res = MainUserTable::getRow([
				'filter' => [
					'ACTIVE' => 'Y',
					[
						'LOGIC' => 'OR',
						'=PHONE_AUTH.PHONE_NUMBER' => $normalizedPhoneForRegistration,
						'=PERSONAL_PHONE' => $normalizedPhone,
						'=PERSONAL_MOBILE' => $normalizedPhone,
					],
				],
				'select' => ['ID'],
			]);
			if (isset($res['ID']))
			{
				$existingUserId = (int)$res['ID'];
			}
		}
	}

	return $existingUserId;
}