Run a php file using URL in crontab.

I want to run a php file from a url using cron tab.
I am using a webhosting and i give a command like that
9 11 9 2 * wget -O /dev/null here-is-domain-name/cronfile.php
but it does not work please tell me why this not work.
I think this command must run a "cronfile.php" and i do not want to recive any email from cron.

Write a wrapper script to set up your environment, or dot your profile first.

try:
curl -s here-is-domain-name/cronfile.php >/dev/null