[Mister0]

PHP код:

new PlayerIDCar[MAX_VEHICLES];
new playercar[MAX_PLAYERS]; 
playercar[playerid] = CreateVehicle(411,0,0,0,2,-1,-1,3600);
PlayerIDCar[playercar[playerid] ] = playerid; 


PHP код:

public OnPlayerEnterVehicle(playerid, vehicleid, ispassenger) 
{ 
  if(vehicleid==playercar[playerid])
  {
    SendClientMessage(playerid,-1,This is your car!);
  }
  else
  {
   new str[128];
   format(str,sizeof(str),"This car is owned by %s",PlayerName(PlayerIDCar[vehicleid ] ) )
  SendClientMessage(playerid,-1,str);
  }
} 


And don't forget to destroy the car

OnPlayerDisconnect(playerid)
{
if(IsValidVehicle(playercar[playerid])
DestroyVehicle(playercar[playerid]);
}