<?php session_start();
if (strpos($_SESSION['portfolio'], ',' . $_GET['recordID']) !== false) {
$_SESSION['portfolio'] .= ',' .$_GET['recordID'];
}
?>
or like this
<?php session_start();
$_SESSION['portfolio'] .= ',' .$_GET['recordID'];
if (strpos($_SESSION['portfolio'], ',' . $_GET['recordID']) !== false) {
$_SESSION['portfolio'] .= ',' .$_GET['recordID'];
}
?>
cant seem to get it to work either way | 
