(table with the username and encrypted password in the data and The logout script.)

Hello, so I am trying to finish up an assignment that was requiring me to password protect my script(which I did it already). I was able to protect it creating the login.php and adding the code below to the index.php. However, my professor still wants two more things from us, that I don't know/have an idea how to do it.

The database table with the username and encrypted password in the data and The logout script. Could you guys help me?

(Below is all the code that I have until now)

(Adding this to index.php or similar:)

login.php:

       
 You must enter the password to view this content.