What could be causing the error in the database?

Question

1C-Bitrix

Colleagues, welcome. I ask for your help!
The site has been transferred from the Bitrix backup, the database has been created and filled in, the access settings have also been checked and are correct. The site shows the error The script encountered an error and will be aborted. To view extended error messages, enable this feature in .settings.php.
Enabled debugger, error code:

[Error] 
Call to undefined function Bitrix\Main\DB\mysql_connect() (0)
/var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/db/mysqlconnection.php:45
#0: Bitrix\Main\DB\MysqlConnection->connectInternal()
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/db/mysqlconnection.php:103
#1: Bitrix\Main\DB\MysqlConnection->queryInternal(string, array, NULL)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/db/connection.php:329
#2: Bitrix\Main\DB\Connection->query(string)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/config/option.php:182
#3: Bitrix\Main\Config\Option::load(string, NULL)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/config/option.php:53
#4: Bitrix\Main\Config\Option::get(string, string, string)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/httprequest.php:337
#5: Bitrix\Main\HttpRequest->prepareCookie(array)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/httprequest.php:63
#6: Bitrix\Main\HttpRequest->__construct(object, array, array, array, array)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/httpapplication.php:42
#7: Bitrix\Main\HttpApplication->initializeContext(array)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/lib/application.php:122
#8: Bitrix\Main\Application->initializeExtendedKernel(array)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/include.php:23
#9: require_once(string)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/include/prolog_before.php:14
#10: require_once(string)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/modules/main/include/prolog.php:10
#11: require_once(string)
  /var/www/www-root/data/www/stroy-teks.ru/bitrix/header.php:1
#12: require(string)
  /var/www/www-root/data/www/stroy-teks.ru/index.php:2

Answer 1

Good afternoon,
You have a typical transfer problem - MySQLi -> MySQL.
Check that the mysql driver is connected or translate to mysqli .

Answer 2

OK Google