Php can already use MySQL and Orcale...
There is nothing PHPDev did but just install PHP and MySQL on your windows system...
You could have also do this manuly...
So if you can find the Install for oracle just install Oracle onto your windows system and set setting accordingly and PHP will be able to use it...
Also look in the PHP Manuel (you can get it at www.php.net)
For there functions...
Hope that answers your question...,
Andrew