[Rimeau]

Basically, but if you have an if() and more than one statement after it, you need to use brackets

pawn Код:

public OnPlayerStateChange(playerid, newstate, oldstate)
{
    if(oldstate == PLAYER_STATE_ONFOOT && newstate == PLAYER_STATE_DRIVER)
    {
        new vehicle = GetPlayerVehicleID(playerid);
        if(vehicle == 25 || vehicle == 26 || vehicle == 27)
        {
            ShowPlayerDialog(playerid, TRUCKINGDIALOG, DIALOG_STYLE_LIST, "Choose a destination.", "From here to LV Depot /*(listitem 0)*/ \nFrom here to Ocean Docks /*(listitem 1)*/ \nFrom here to Verona/*(listitem 2)*/", "Ok", "Cancel Job");
        }
    }
    return 1;
}

I added "||", which is an OR