how to get php errors to show on syslog

I have a script which is scheduled to run on crontab. I noticed that I could not see php errors anywhere. I wanted to be able to see php errors logged on /var/log/syslog or some place else. I have tried configuring my php.ini to log the errors on /var/log/php-errors.log, checked permissions and restarted the apache service still no logs.