modificato cosi e mi restituisce array()

codice:
$copertine = '../immagini/covers/';
var_export($_FILES);print'
'; 
if ($_FILES["copertina"]["error"] == UPLOAD_ERR_OK) { 
  $tmp = $_FILES["copertina"]["tmp_name"]; 
  $name = $_FILES["copertina"]["name"]; 
  print $name.'
';
  $x = move_uploaded_file($tmp, "$copertine/$name"); 
  print $x.'
';
};
$pdfestratto = '../pdf_estratto/';
if ($_FILES["pdf_estratto"]["error"] == UPLOAD_ERR_OK) { 
  $tmp = $_FILES["pdf_estratto"]["tmp_name"]; 
  $name = $_FILES["pdf_estratto"]["name"]; 
  print $name.'
';
  $x = move_uploaded_file($tmp, "$pdfestratto/$name"); 
  print $x.'
';
};
$pdfsommario = '../pdf_sommario/';
if ($_FILES["pdf_sommario"]["error"] == UPLOAD_ERR_OK) { 
  $tmp = $_FILES["pdf_sommario"]["tmp_name"]; 
  $name = $_FILES["pdf_sommario"]["name"]; 
  print $name.'
';
  $x = move_uploaded_file($tmp, "$pdfsommario/$name"); 
  print $x.'
';
};