torno con la richiesta su UPLOAD MULTIPLI

il mio file

Codice PHP:
<form action="itinerari_step3.php" name="itinerari" method="POST" encoding="multipart/form-data">
<table>
<tr><td width="200px" align="right">Cartella</td><td><?php print $nomefile ?>
</td></tr>


<?php
$tot_img = $_POST['tot_img'];
echo "<tr><td width=\"200px\" align=\"right\"><td><input type=\"hidden\" name=\"tot\" value=\"$tot_img\"</td></tr>";


$x=1;
while($x<=$tot_img){
echo "<tr><td width=\"200px\" align=\"right\">Foto $x</td><td><input type=\"file\" name=\"foto[]\" /></td></tr>";

$x++;
}
?>

<tr><td width="200px" align="right"><td><input type="hidden" name="dir" value="<?php print $nomefile ?>"</td></tr>
<tr><td width="200px" align="right"><td><input type="submit" name="submit" value="Invia"</td></tr>
</table>
</form>

Codice PHP:
$dir = $_POST['dir'];
$tot_img = $_POST['tot'];


foreach ($_FILES['foto'] as $key => $value) {
 
if(!is_uploaded_file($_FILES['foto']['tmp_name'][$key])){
 
print "

nessun file è stato trasferito</p>";   
print error_reporting();
@unlink($_FILES['foto']['tmp_name'][$key]);

} else {
 $nome =$_FILES['foto']['name'][$key];
 
 // copia i file nella cartella di destinazione e cancella i temp
  copy($_FILES['foto']['tmp_name'][$key],"....mio percorso....");
@unlink ($_FILES['foto']['tmp_name'][$key]);
print "

File aggiunto con successo.</p>";
    
}
} 
Perchè mi da errore di Udentifiet index: foto ?????