/* This is the HTML code, I am posting this to a file called thumbnail_generator.php
<input type="file" name="pictures[]" id="pictures" />
*/
// This is the upload section of thumbnail_generator.php
$pictures = $_POST['pictures'];
foreach ($_FILES["pictures"]["error"] as $key => $error) {
   if ($error == UPLOAD_ERR_OK) {
       $tmp_name = $_FILES["pictures"]["tmp_name"][$key];
       $name = $_FILES["pictures"]["name"][$key];
       move_uploaded_file($tmp_name, "tmp/$name");
	   print "Success!";
   }
}