end goal: HTML element is click i want to run PHP functions

so i want to do something like this

  function byeBye(page) {
    if (page == 'teacher.php') {
      <?php $_SESSION['AccType'] = 1; ?>
    } else if (page == 'admin.php') {
      <?php $_SESSION['AccType'] = 2; ?>
    }
    console.log('Redirecting to ' + page);
    window.location.href = './' + page;
  }
</script>

and it called with something like this <li id='admin' class="list-group-item" onclick="byeBye('admin.php')"> but you can see what is wrong with that. what is the right way to do this?