Thanks Evo - that's exactly what I was looking for.
whereis php gives me:
php: /usr/bin/php /etc/php.ini /usr/lib/php /usr/lib/php.ini
/usr/local/bin/php /usr/local/lib/php /usr/local/lib/php.ini /usr/include/php
Do you know if it's normal to have /usr/bin/php and /usr/local/bin/php - that looks like duplicate installations to me?
Thanks Memetic for the link - it has been bookmarked