What is the problem: Fatal error: Uncaught Error: Call to undefined function mysqli_connect() PHP8?

Question

PHP

Good afternoon, I really hope that they can help me here. There is a registration form in which you need to enter a login password stored in the MySQL database. I did not write the PHP code, it was given ready-made, the task was to set up the connection. When trying to login, it gives the following error:

Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in D:\Server\bin\mysite\index.php:7 Stack trace: #0 {main} thrown in D:\Server\ bin\mysite\index.php on line 7 I

have already reviewed a bunch of videos and re-read many forums, but I did not find a solution, I uncommented the extensions in the php.ini file, mysqlnd 8.0.8 is installed. database access is correct. What could be the problem, I just have no idea. Please tell me what to do, how to decide where to look, what else to read or watch.

Answer 1

https://www.php.net/manual/ru/function.get-loaded-...
https://www.php.net/manual/ru/function.phpinfo.php
in case of apache - restart apache. In case of php fpm - restart puff.