on *:TEXT:!setpcw*:#: { if ($nick isvoice $chan) || 
  ($nick ishop $chan) || ($nick isop $chan) || 
($nick isop $chan){ set %world $2 } }
on *:TEXT:!world:#: { if ($nick isvoice $chan) || 
  ($nick ishop $chan) || ($nick isop $chan) 
{ /notice $nick The world is currently %world } }