Undefined Index Errors

Hey guys, Here's a chunk of code from the top of a multi-function page I converted from Perl to PHP: $userid = $_REQUEST['USERID']; # USERID = selected userid $dlist = $_REQUEST['DLIST']; # DLIST = indicates who to display $action = $_REQUEST['ACTION']; # ACTION = indicates approval or denial $more = $_REQUEST['MORE']; # MORE = ID of person to show details $delete = $_REQUEST['DELETE']; # DELETE = indicates to delete user $ltr = $_REQUEST['LTR']; # LTR = start ltr of last name $modpwd = $_REQUEST['MODPWD']; # MODPWD = indicates modifying pwd $expire = $_REQUEST['EXPIRE']; # EXPIRE = indicates to expire pwd $upduser = $_REQUEST['UPDUSER']; # UPDUSER = indicates user info updated $denyuser = $_REQUEST['DENYUSER']; # DENYUSER = indicates user was denied $reason = $_REQUEST['REASON']; # REASON = Reason user was denied $adminID = $_ENV['HTTP_REMOTE_USER']; I'm creating some strings from array elements obviously. The issue is, the array elements don't always exist depending on which function you are running. And when they don't, the server log is full of undefined index errors. Is there a way I can avoid these errors without adding a "if(isset(...))" around each one? Thanks, Cameron