I use directadmin, and the sample cronjob they says like this:
Sample cron commands:
/usr/local/bin/php /home/username/domains/domain.com/public_html/script.php
/usr/local/bin/curl --silent http://www.domain.com/cron.php > /dev/null
/usr/bin/wget -O /dev/null http://www.domain.com/cron.php
So...