It will depend on how you configured your Apache server. On a standard installation of Apache/php you can just place a phpinfo.php test file in the /Apache/http/ folder. The file's contents should be:
CODE
<?php
phpinfo();
?>
and call it via 192.168.1.64/phpinfo.php to get a nice view of your php server's information.
There is no need to add the "localhost" string to the server's IP address. localhost, is a string that represents the local machines IP address. So in your case localhost = 192.168.1.64.
You can try it out by entering localhost/phpinfo.php in your URL.
Also the username string is probably unnecessary unless you have enabled a per-user home folder structure (I doubt that).
Hope this helps,
hecker