How can I connect to my mysqli database without errors?

// Database connection variables
$host = "localhost";  
$username = "root";  // 
$password = "";      // 
$dbname = "php_pro";  // 

// no 9 Create a new MySQLi connection
$conn = new mysqli("localhost", "root", "", "php_pro");

// Check if the connection was successful
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

The program yields ‘not able to connect to mysql’.

Fatal error: Uncaught Error: Class "mysqli" not found in C:\xampp\htdocs\php-project\database_connection.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\php-project\database_connection.php on line 9

I uncommented extension=mysql in xampp already. info.php says my sql is enabled, but the error persists.

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