PHP: Загрузка файлов на сервер

<?php
if ($HTTP_POST_VARS['submit'])
{
 if (!is_uploaded_file($HTTP_POST_FILES['file']['tmp_name']))
 {
 $error = "You did not upload a file!";
 unlink($HTTP_POST_FILES['file']['tmp_name']);
 // assign error message, remove uploaded file, redisplay form.
 }
 else
 {
 //A file was uploaded
 $maxfilesize=300000;
 if ($HTTP_POST_FILES['file']['size'] > $maxfilesize)
 {
   $error = "File is too large.";
   unlink($HTTP_POST_FILES['file']['tmp_name']);
   // assign error message, remove uploaded file, redisplay form.
 }
 else
 {
    //File has passed all validation, copy it to the final destination and remove the temporary file:
    copy($HTTP_POST_FILES['file']['tmp_name'],$HTTP_POST_FILES['file']['name']);
    unlink($HTTP_POST_FILES['file']['tmp_name']);
    print "File has been successfully uploaded!";
    exit;  
   }
  }
}
?>

<form action="<?=$PHP_SELF?>" method="post" enctype="multipart/form-data">
  <input type="file" name="file"><br>
  <input type="submit" name="submit" value="submit">
</form>