Baffling result using strtoupper()

[Anon]

As an exercise, I'm writing a case converter for html code (lower to upper). I've started with a simplified snippet - but the result is bizarre:

<?php
setlocale (LC_CTYPE, "");

$str = [whatever];
$str = strtoupper ($str);
print "$str";
?>

Consider these strange results for different values of $str:

(1) When $str="<form", the output is:
(nothing, null, dada) ?!!?

(2) However, when $str="< form", the output is:
< FORM

(3) And when $str="<", the output is:
"<"

(4) Finally, when $str=">form", the output is:
">FORM"

Any thoughts on the strange result in scenario #1?

Thanks,
Mitch

[[deleted]]

Which version of PHP are you using?

[Anon]

vincent wrote:

Which version of PHP are you using?

I'm using version 4.0.4pl1 (via a web hosting provider).

Mitch