[Calgon]

License plates (and I assume that the godfather usage is a string, too.) are strings and not purely integers.

pawn Код:

stock GetVehicleIDFromPlate(plate[])
{
    for(new i = 0; i < sizeof(CarInfo); i++)
    {
            if(!strcmp(plate, CarInfo[i][cLicense], true)) return i; 
    }
    return 0;
}

You also need to change how you're using the function:

pawn Код:

GetVehicleIDFromPlate(inputtext);