how to destroy session value in saving web page

Question

I want to destroy session when my webpage is save(Ctrl+s) in local system.

session_start();

if (isset($_SESSION['id']))
    {
    $id = $_SESSION['id'];
    print_r($admin_id);
    }
  else
    {
    echo 'not avil';
    }
}

when i am saving my web page i am getting id

so, i do not want to print id, i want "not avil" when my web page and open form on local system. can any one have solution for this in PHP or java script?

Answer 1

Add an event listener that listens for the SHIFT and S key when pressed together, delete your data when it calls a function.

https://www.w3schools.com/jsref/met_element_addeventlistener.asp