CMD:dice(playerid, params[]) { // zcmd command
    new
        Float: fPlayerPos[3], // create a variable to store a player's position
        szPlayerName[MAX_PLAYER_NAME], // create a variable to store a player's name
        szMessage[64]; // create a string we can use to format our message

    GetPlayerName(playerid, szPlayerName, MAX_PLAYER_NAME); // get the player's name
    GetPlayerPos(playerid, fPlayerPos[0], fPlayerPos[1], fPlayerPos[2]); // get the player's position
    format(szMessage, sizeof(szMessage), "* %s has rolled a dice which landed on %d", szPlayerName, 1+random(6)); // format the string with our message
    // random(6) gets a number between 0 to 5, so I've added random(6) on to 1, so the number will be between 1 and 6.
    // the rest of the line above generally formats the message to send to the player, we show their name and the number the dice landed on
    
    // I'd advice usage of a function for this, like ProxDetector of whatever you have to your avail
    for(new i; i < MAX_PLAYERS; i++) { // loop through all players online
        if(IsPlayerConnected(i) && IsPlayerInRangeOfPoint(i, 10, fPlayerPos[0], fPlayerPos[1], fPlayerPos[2])) { // check if they're within 10 units of whatever distance is used as well as if the player slot # is connected
            SendClientMessage(i, 0, szMessage); // send the message to them if the above criteria is met
        }
    }
    
    return 1;
}