Why is cron not working?

Question

linux

There is a server on CentOS.
You need to install crons so that cron is executed every minute at var/www/html/1.php
In etc/crontab entered - */1 * * * * /usr/bin/php /var/www/html/1.php > /dev/null 2>&1
But for some reason it doesn't work. What is the problem?

Answer 1

what does the cron log in /var/log/cron say?
and is there any confidence that you have chosen the right place to "write in" the team?

Answer 2

superuser.com/questions/290093/difference-between-...

Answer 3

Is there a last empty line?