[Lewwy]

This is how you would check anyway.

pawn Code:

for(new i = 0; i < MAX_PLAYERS; i ++)
{
  if(IsPlayerConnected(i))
  {
    if(IsPlayerInVehicle(i, GetPlayerVehicleID(playerid)))
    {
      SendClientMessage(i, color, string);
    }
  }
  return 1;
}