I'm implementing the backend to allow data storage for a website. I need to use the phpEd debugger, but I constantly run into this error:

Error: E_ERROR
Class 'mysqli' not found
at class.Connect.php line 21

This is the line 21:
$this->conn =& new mysqli($server, $user, $password, $db);

If I however test it in a browser, I don't have any mysqli connection problem. So, why am I getting this error in the phpEd debugger, and what can I do to get it working?

Try to remove semicolon

;extension=php_mysqli.dll

in php.ini