[PHP] PHP_SELF or REQUEST_URI within Function ?

[Arcadius A.]

Hello !
Why this script   prints an empty string(it prints nothing) as the  value of
the variable "u" ?
This happens even if  $REQUEST_URI or PHP_SELF is used instead of
SCRIPT_FILENAME .
Thanks...

<?
function menu( $theurl)
{
//global $u ;
$u = $SCRIPT_FILENAME;
echo $u;
echo $theurl;
}
?>

Hello there !!!

<? menu(hoho.com) ?>




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