if ($_GET['go'] == "yes"){
if ($_GET['loggedin'] == "true"){
function dosomething (){
$_GET['loggedin'] = false;
echo "You have been successfully logged out.
}
}
if ($_GET['loggedin'] == "false"){
function dosomething (){
$_GET['loggedin'] = true;
echo "You have been successfully logged in.
}
}
dosomething();
}
if ($_GET['loggedin']){
?>click here to log out } elseif (!$_GET['loggedin']){
?>click here to log in }
?>