[Sew_Sumi]

You need an

PHP код:

if(currentvehicle)
{
DestroyVehicle(currentvehicle);
} 


PHP код:

//new currentveh;   <<<<<Not Work Good! because you shouldn't do this...
                        //currentveh = GetPlayerVehicleID(playerid); //<<<<<Not Work Good! 
if(currentvehicle[playerid])
{
DestroyVehicle(currentvehicle[playerid]);
}
                        //DestroyVehicle(currentveh);   //<<<<<Not Work Good! 


before you create the next one.

currentvehicle will only work for the one, so if another person makes a new vehicle, it'll wipe out whoevers vehicle was last made.

You need it to be an array

PHP код:

new currentvehicle[MAX_PLAYERS]; 


up top of the script, not in the middle. Otherwise when one person uses it, there'll only be one vehicle ever spawned, no matter who uses the command.