ya lo hago
Código PHP:
if (!isset($_SESSION)) {
session_name("borrar");
session_start();
$_SESSION['tipo'] = $_POST['tipo'];
$_SESSION['dia_ini'] = $_POST['dia_ini'];
$_SESSION['mes_ini'] = $_POST['mes_ini'];
$_SESSION['ano_ini'] = $_POST['ano_ini'];
}
if(isset($_POST['tipo'])){
$host = $_SERVER['HTTP_HOST'];
$uri = rtrim(dirname($_SERVER['PHP_SELF']),'/\\');
....
O lo hago mal