Query WMI remotely with PHP

Question

My current code looks like this:

define ( 'CPU_NAME', 'remote_server' );
$obj = new COM ( 'winmgmts:{impersonationLevel=impersonate}//' . CPU_NAME . '/root/cimv2' );
if ( is_object ( $obj ) ){ 
     $process = $obj->execquery ( "SELECT * FROM Win32_Process" );
}

Where would I put the login credentials for the remote_server? I see that it would take a username and password, but I'm not sure how to implement that.

Any help would be appreciated.

Reference: http://us3.php.net/manual/en/class.com.php