Run file every few days

Use the Cron Job on Cpanel.

Yes i thought of that, but how?

you write a script that queries your database for "if a user has activated there account after 7 days", if not "delete".

so basically, if you run the script directly, it does that - check and delete.

what you might want to do it for the script to run automatically, once a day for example. Open up cron job and you should find once a day in the "common settings".

As for the command, it should be something like this - "php /home/cashrun/public_html/joshl/check_delete_unactivated.php" - whenever the script is located.

What does "PHP -f" mean