[CodeStyle175]

well you could create temporary array for tunings and when cancel is pressed, everything from array is removed.

PHP код:

new arrTempComps[max_players][14];
AddCompForPreview(pid,vid,comp){
    arrTempComps[pid][GetVehicleComponentType(comp)]=comp;
    AddVehicleComponent(vid,comp);
    return 1;
}
SavePreviewComps(pid,vid){
    for(new i; i < 14; i++){
        Vehicle[vid][Tuning][i]=arrTempsComps[pid][i];
    }
    new s[120];
    format(s,120,"update vehs set tune0...");
    mysql_tquery(con0,s);
    return 1;
}
RemovePreviewComps(pid,vid){
    for(new i; i < 14; i++)if(arrTempComps[pid][i])RemoveVehicleComponent(vid,arrTempComps[i]),arrTempComps[i]=0;
    return 1;
}