[Smally]

pawn Код:

stock nearByMessage(playerid, color, string[], Float: Distance = 12.0) {
    new
        Float: nbCoords[3];

    GetPlayerPos(playerid, nbCoords[0], nbCoords[1], nbCoords[2]);

    foreach(Player, i) {
        if(IsPlayerInRangeOfPoint(i, Distance, nbCoords[0], nbCoords[1], nbCoords[2]) && (GetPlayerVirtualWorld(i) == GetPlayerVirtualWorld(playerid))) {
            SendClientMessage(i, color, string);
        }
    }

    return 1;
}

Then use nearByMessage instead of SendClientMessage when you want to send it to near by players.