Error when migrating a site to Bitrix (Call to undefined function mysqli_init()), how to get rid of it?

Question

MySQL

Hello. Moved site to Centos 7 VM.
Gentleman's set: apache, php, mysql.
I launched the restore.php file, deployed the backup, separately deployed the dump to the database. I go to the site, I get:

Call to undefined function mysqli_init() (0)
/var/www/html/roll-express.com/bitrix/modules/main/lib/db/mysqliconnection.php:48
#0: Bitrix\Main\DB\MysqliConnection->connectInternal()
  /var/www/html/roll-express.com/bitrix/modules/main/lib/db/mysqliconnection.php:122
#1: Bitrix\Main\DB\MysqliConnection->queryInternal(string, array, NULL)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/db/connection.php:330
#2: Bitrix\Main\DB\Connection->query(string)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/config/option.php:226
#3: Bitrix\Main\Config\Option::load(string, NULL)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/config/option.php:53
#4: Bitrix\Main\Config\Option::get(string, string, string)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/httprequest.php:392
#5: Bitrix\Main\HttpRequest->prepareCookie(array)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/httprequest.php:69
#6: Bitrix\Main\HttpRequest->__construct(object, array, array, array, array)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/httpapplication.php:46
#7: Bitrix\Main\HttpApplication->initializeContext(array)
  /var/www/html/roll-express.com/bitrix/modules/main/lib/application.php:122
#8: Bitrix\Main\Application->initializeExtendedKernel(array)
  /var/www/html/roll-express.com/bitrix/modules/main/include.php:23
#9: require_once(string)
  /var/www/html/roll-express.com/bitrix/modules/main/include/prolog_before.php:14
#10: require_once(string)
  /var/www/html/roll-express.com/bitrix/modules/main/include/prolog.php:10
#11: require_once(string)
  /var/www/html/roll-express.com/bitrix/header.php:1
#12: require(string)
  /var/www/html/roll-express.com/404.php:7
#13: include_once(string)
  /var/www/html/roll-express.com/bitrix/urlrewrite.php:4

Following what Google gave out, in the file /bitrix/php_interface/dbconn.php I added the constant define("BX_USE_MYSQLI", false), and in the file /bitrix/.settings.php I changed '\\Bitrix\\Main\\DB\ \MysqlConnection' to '\\Bitrix\\Main\\DB\\MysqliConnection'. The error still remains.
There were recommendations
1) to uncomment the line "extension=php_mysqli.dll" in php.ini, but I don't have it.
2) along the path "/etc/php.d/" create the file "30-mysqli.ini" and add the line "extension=mysqli.so" there. The error remains. I can't figure out why the error persists.
phpinfo() works well.
Tell me, in which direction can I dig more?)

Answer 1

Install mysqli extension

Answer 2

PhpInfo, "working well", what does it indicate about the presence of the mysqli extension?
That is, turned off the use of MySqli and began to use it. Logically...