problem in connecting to mysql from php

[C0mf0rtably Numb <08.kushal@xxxxxxxxx>]

Hello everyone,

I am in the process of learning php and I was trying to connect to a mysql
database on my own computer(localhost). I have done the following as
prerequisites:

copied the dll files in system32
removed the semicolon(;) from extension=php_mysqli.dll

In spite of doing the above when I try to run the following :

<?php
$db = new MySQLi('localhost', 'root', 'Password123', 'test');
$sql = 'SELECT * FROM a123';
$result = $db->query($sql);

while($row = $result->fetch_object()) {
    echo '<div>' . $row->name . '</div>';
}

$db->close();
?>

I get the error: *Fatal error*: Class 'MySQLi' not found in *C:\Program
Files\Apache Software Foundation\Apache2.2\htdocs\a.php* on line *2

*Please guide me as to how can I get rid of this error?

Regards,
Kushal