Simple login using php (part 4)

Here i will explain about logging out of the session.

<?php

//session starts here

session_start();

//makes sure userid is registered

if(session_is_registered('userid')){

//if session is registered only then user can log out

session_unset();

}

session_destroy();

else{

//if user is not registered then the logout should not work and redirect user to login page

header( "Location: http://login.html" );

}

?>