PHP 5 variable functionality.
<?php $myvar = 0; $yourvar = "This is my value<br />"; $myvar = $yourvar; $myvar = "This is now my value.<br />"; echo $yourvar; $myvar = &$yourvar; $myvar = "This is now my value.<br />"; echo $yourvar; $formvar = $_POST['formvar']; if ($_SESSION['loggedin']){ echo "Proper login"; } else { echo "You are not logged in."; } ?>