for(new i=0;i<10;i++)
{
    if(PlayerInfo[id][Item][i] == 0) // if slot is vacant
    {
        PlayerInfo[id][Item][i] = 1; // set slot to item (v1)
        break;
    }
    if(PlayerInfo[id][Item][i] == 1) // if slot has v1 item
    {
        PlayerInfo[id][Item][i] = 2; // upgrade to v2 item
        break;
    }
    if(PlayerInfo[id][Item][i] == 2) // if slot has v2 item
    {
        PlayerInfo[id][Item][i] = 3; // upgrade to v3 item
        break;
    }
}