I am following this PHP Google+ tutorial and I am trying to install composer in my WAMP directory
C:\wamp\www\gplus-quickstart-php>curl -s https://getcomposer.org/installer | php
but I'm getting this error
'php' is not recognized as an internal or external command operable program or batch file.
How do I resolve this problem? I already have PHP installed (via WAMP Server). Do I have to install PHP in my computer as well?