then you need to store the array on a cookie or on a session.
Cookie version:
if (isset ($_COOKIE['names']) )$names = unserialize ($_COOKIE['names']);
else $names = array();
if (!in_array ($_GET['name'],$names) ) $names[] = $_GET['name'];
setcookie ('names',serialize ($names) );
session version:
session_start();
if (isset ($_SESSION['names']) )$names = $_SESSION['names'];
else $names = array();
if (!in_array ($_GET['name'],$names) ) $names[] = $_GET['name'];