if you want to setup a cron job under different user or under apache, find out who is the owner of apache process
ps aux | grep apache
in my case the owner of apache process is “daemon”.
now create a cron job under “demon” user
crontab -u daemon -e
Now insert any cron job
* * * * * cd /usr/local/apache/htdocs/website; /usr/local/bin/php webpage.php > /dev/null 2>&1