How to assign cron jobs through php

Question

Is it possible to schedule some tasks in php to run automatically on the server at a certain time of the day? . I heard abt cron jobs. is there any way to set it via php code

Answer 1

http://php.net/system lets you to run any command-line utility.

As for the certain command to set a cron job you have either to google a little or ask on serverfault.