$ _SESSION returning null

I'm saving on some values using $_SESSION .

<?php
session_start();
include_once '../controller/LocacaoController.php';
if(!empty($_REQUEST['idfilme']) and !empty($_REQUEST['idfita'])){
  $idfilme = $_REQUEST['idfilme'];
  $idfita = $_REQUEST['idfita'];

  $_SESSION['codfilme'] = $idfilme;
  $_SESSION['codfita'] = $idfita;
  echo "entrou aqui";

}
else {

  if(!empty($_SESSION['codfilme']) and !empty($_SESSION['codfita'])){
      $_SESSION['codfita'] = null;
      $_SESSION['codfilme'] = null;
  }
}

?>

The code is as follows: if in my other file I pass values to $_REQUEST['idfilme'] and $_REQUEST['idfita'] then it enters IF and saves to session, Now if $_REQUEST is empty it goes to ELSE and adds% with% as NULL and $_SESSION['codfita']

Then in another file I retrieve these values:

<?php
  session_start();
  include_once '../controller/LocacaoController.php';


  $idCliente = $_SESSION['cliente'];
  $idFita = $_SESSION['codfita'];

  $idFilme = $_SESSION['codfilme'];
  var_dump($idFita);
  var_dump($idFilme);

  if(!empty($_SESSION['codfita'])){

    $idFita = $_SESSION['codfita'];
    $idFilme = $_SESSION['codfilme'];
  }

  ?>

But the problem is that even though I pass values to $_SESSION['codfilme'] and $_REQUEST['idfilme'] and entering $_REQUEST['idfita'] of code 1, on the other screen it is returning IF .

NOTE: Do not worry about null , and the connection of the files because it is working properly, the problem is $_REQUEST .