[DeeadPool]

it will be something like:-

PHP код:

new skinlist = mS_INVALID_LISTID; //at the top

skinlist = LoadModelSelectionMenu("skins.txt"); //Under OnGameModeInIt

CMD:changeskin(playerid, params[])
{
        ShowModelSelectionMenu(playerid, skinlist, "Select Skin");
        return 1;
}
public OnPlayerModelSelection(playerid, response, listid, modelid)
{
    if(listid == skinlist)
    {
        if(response)
        {
             for(new i = 0; i < MAX_PLAYERS; i++)
               {
                     SetPlayerSkin(i, modelid);
               }
        }
        return 1;
    }
    return 1;
}