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//When the player exit the game, i call SaveData(playerid); : 

SaveData(playerid)
{
    if (dini_Exists(FileName(playerid)) && PlayerInfo[playerid][Logged]) 
    {
        dini_IntSet(FileName(playerid),"level",PlayerInfo[playerid][Level]);
        dini_IntSet(FileName(playerid),"language",PlayerInfo[playerid][Language]);
    }
    return 1;
}


//And when the player login, i call LoadData(playerid); :

LoadData(playerid)
{
    if (dini_Exists(FileName(playerid)) && PlayerInfo[playerid][Logged])
    {
        PlayerInfo[playerid][Level] = dini_Int(FileName(playerid),"level");
        PlayerInfo[playerid][Language] = dini_Int(FileName(playerid),"language");
    }
    return 1;
}