Someone

on *:TEXT:!inviteall:#: {
  if ($nick isop $chan) || ($nick ishop $chan) || ($nick isin %admins) { 
    /hi $chan
  }
}
alias hi {
  var %a = $nick($1,0)
  while ($nick($1,%a) isin $1) {
    /invite $nick($1,%a) #noobz
    dec %a
  }
}