How to set a cron job using PHP in webmin

I have a CentOS server to test my all projects. According to clients requirement webmin is installed as admin panel. Today I had tried to use a cron PHP script in that server and succeeded. This is how I have setup the cron job.

In the webmin panel ther is a menu group named ‘Cluster’;
So from that menu group -> Cluster Cron Job.
Then I have added a new cron job.
1. Selected user ‘apache’.
2. in the command box:
/usr/bin/php -q /full/path/to/the/cronjob.php
3. Then selected the time which I want the cron job should be done.

Wow… It’s working. Please feel free to ask if you need any further help regarding this.