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If you have multiple upload fields, they will have the same name, right?

So assuming that you have three of these upload fields, called my_field[], and that the user enters a file for the first and third field only, $_FILES will be as following:

Array
  [my_field] => Array
    [name] => Array
      [0] => P1040124.JPG
      [1] => 
      [2] => P1040281.JPG
    [type] => Array
      [0] => image/jpeg
      [1] => 
      [2] => image/jpeg
    [tmp_name] => Array
      [0] => /tmp/php0bMcTr
      [1] => 
      [2] => /tmp/phpxf9Rr5
    [error] => Array
      [0] => 0
      [1] => 4
      [2] => 0
    [size] => Array
      [0] => 2959714
      [1] => 0
      [2] => 2329004

We need to re-organize the array for the class, with.

$files = array();
foreach ($_FILES['my_field'] as $k => $l) {
 foreach ($l as $i => $v) {
 if (!array_key_exists($i, $files)) 
   $files[$i] = array();
   $files[$i][$k] = $v;
 }
}

So we have now in $files:

Array
  [0] => Array
    [name] => P1040124.JPG
    [type] => image/jpeg
    [tmp_name] => /tmp/php7aqJYX
    [error] => 0
    [size] => 2959714
  [1] => Array
    [name] => 
    [type] => 
    [tmp_name] => 
    [error] => 4
    [size] => 0
  [2] => Array
    [name] => P1040281.JPG
    [type] => image/jpeg
    [tmp_name] => /tmp/phpKet10G
    [error] => 0
    [size] => 2329004

So we need to modify our loop so that $files doesn't include the second entry in the array, which is for the non-uploaded file. So the loop becomes:

$files = array();
foreach ($_FILES['my_field'] as $k => $l) {
  foreach ($l as $i => $v) {
    if (!array_key_exists($i, $files)) 
      $files[$i] = array();
    $files[$i][$k] = $v;
  }
}
// we now remove invalid entries for non-uploaded images
foreach ($files as $k => $v) {
  if ($v['error'] != 0) unset($files[$k]);
}

So now you can feed $files into class.upload.php, for instance doing as following:

foreach (array_keys($files) as $k) {
  $handle = new upload($files[$k]);
  // process your upload here
}

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