$HTTP_POST_FILES is empty

[Anon]

Hello.

Using PHP 3.0.18 on Solaris+Zeus. In 'php.ini', track_vars = 1.

I want to upload a file:

form.html

<form enctype="multipart/form-data" action="upload.php" method="post">
<input type="hidden" name="MAX_FILE_SIZE" value="1000">
Send this file: <input name="userfile" type="file">
<input type="submit" value="Send File">

</form>

upload.php

<?php
echo "VALUE OF 'username': " . $HTTP_POST_FILES['userfile']['name'];

?>

But this value is always empty!!! And I can not upload any file.

What am I doing wrong?

[Anon]

Checking phpinfo():

track_errors = 0
track_vars = 1
upload_max_filesize = 2097152
upload_tmp_dir = none