public OnPlayerCommandText(playerid, cmdtext[])
{
  new cmd[30];
  new idx;
  cmd = strtok(cmdtext, idx);
 
  if(strcmp(cmd, "/sayhello", true) == 0)
  {
    new tmp[30];
    // assign the id (written by the user) to tmp
    tmp = strtok(cmdtext, idx);
 
    // convert the id to an integer using strval (this is essential)
    // and assign to otherplayer
    new otherplayer = strval(tmp);
 
    if(IsPlayerConnected(otherplayer))
    {
      SendClientMessage(otherplayer, 0xFFFF00AA, "Hi, hello!");
    }
    return 1;
  }
  return 0;
}

dcmd_ban(playerid, params[])
{
	new
		id,
		reason[64];
	if (sscanf(params, "uz", id, reason)) return SendClientMessage(playerid, 0xFF0000AA, "Usage: \"/ban <playerid/partname> <reason (optional)>\"");
	else if (id == INVALID_PLAYER_ID) return SendClientMessage(playerid, 0xFF0000AA, "Player not found");
  	if(!IsPlayerAdmin(playerid)) return SendClientMessage(playerid,COLOR_RED,"ERROR: You are not a high enough admin.");
	else
	{
	 
		BanEx(id, reason);
		format(reason, sizeof (reason), "You have been banned%s%s.", reason[0] ? (" for: ") : (""), reason);
		SendClientMessage(id, 0xFF0000AA, reason);
		SendClientMessage(playerid, 0x00FF00AA, "Player banned");
	}
	return 1;
}