I\'m new to using cron job. I don\'t even know how to write it. I have tried to search from internet, but I still don\'t understand it well. I want to create a cron job that
That may depend on your web host if you are not hosting your own content. If your web host supports creating chron jobs, they may have a form for you to fill out that lets you select the frequency and input the absolute path to the file to execute. For instance, my web host (DreamHost) allows me to create custom cron jobs by typing in the absolute path to the file and selecting the frequency from a select menu. This may not be possible for your server, in which case you need to either edit the crontab directly or through your host specific method.
As Alister Bulman details above, create a PHP file to run using CLI (making sure to include #!/usr/bin/env php at the very start of the file before the tag. This ensures that the shell knows which executable should be invoked when running the script.