[PHP] Using $PHP_SELF

[Buntin, Seth - KATE]

I am having problems while transfering information to another page.  I
am using $PHP_SELF and I am getting errors here is a bit of code so you
can see what I am saying:
 
echo "<a href='$PHP_SELF?file=$file&dir=".$mydir."'>$file</a><BR>\n";
 
This is what the browser is saying...
Notice: Undefined variable: PHP_SELF in
c:\inetpub\wwwroot\test\download.php on line 54
 
I don't know what to do.