Question

I want to Insert data in a table, data of last week at 11:59 on every sunday

Answer 1

Dont use sleep() for this, is a bad practice to keep a process active all the time for this. Use cron as is the right tool for the right job.

If you use linux than do this in a console as a root

crontab -e 

This will allow you to edit the cron joblist. Add a line with

# m h  dom mon dow   command
59 11 * * 0 /bin/php /path/to/your_script.php