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I think this is the right what you want.

PHP код:

case DIALOG_P:
{
    if(!response)return 1;
    new count;
    for(new i;i<sizeof(Item);i++)
    {
        if(listitem == count)
        {
            //Item[i][item_type] is the "Item-Type" which is clicked in the dialog.
            UsePlayerItem(playerid, Item[i][item_type], Item[i][item_uid]);
            break;
        }
        count ++;
    }
}