File Directory Php

" enctype="multipart/form-data" method="post">
   Last Name: 
   Homework: 
   



   define ("FILEREPOSITORY","./");
   if (isset($_FILES['homework'])) {
      if (is_uploaded_file($_FILES['homework']['tmp_name'])) {
         if ($_FILES['homework']['type'] != "application/pdf") {
            echo "

Homework must be uploaded in PDF format.

";
         } else {
            $today = date("m-d-Y");
            if (! is_dir(FILEREPOSITORY.$today)) {
               mkdir(FILEREPOSITORY.$today);
            }
            $name = $_POST['name'];
            $result = move_uploaded_file($_FILES['homework']['tmp_name'], FILEREPOSITORY.$today."/"."$name.pdf");
            if ($result == 1) 
               echo "

File successfully uploaded.

";
            else 
               echo "

There was a problem uploading the homework.

";
         }
      }
   }
?>