php is not recognized as an internal command (in Windows)

I want to develop using a framework called Symfony but I do not have a Mac and I don't want to dual boot with Debian.

I tried virtual hosts via Virtual Box but it doesn't work. So I decided to stay on Windows.

So when the tutorial tells me to do

php lib/vendor/symfony/data/bin/check_configuration.php

i do in the windows cmd :

php lib\vendor\symfony\data\bin\check_configuration.php

and it tells me:

'php' is not recognized as an internal or external command

I use UwAmp (php 5.2.12 + mysql + apache) which is stored in

E:\logiciels\UwAmp\

inside I have bunch of files, but I guess that is important:

E:\logiciels\UwAmp\apache\php_5.2.11

How to make the cmd PHP in the windows cmd work properly?