[ThePhenix]

Try it:

I think you should add a Timer to update the textdraw:

PHP Code:

new Text:killstext;
public OnGameModeInit()
{
    killstext = TextDrawCreate(1.0, 5.6, " ");
    TextDrawAlignment(killstext, 2);
    TextDrawBackgroundColor(killstext, 255);
    TextDrawFont(killstext, 3);
    TextDrawLetterSize(killstext, 0.709998, 2.100001);
    TextDrawColor(killstext, -1);
    TextDrawSetOutline(killstext, 1);
    TextDrawSetProportional(killstext, 0);
    return 1;
}
stock HandleKS(playerid, killerid) //put this function outside of any callbacks or functions
{
     killstreak[playerid] = 0;
     killstreak[killerid] ++;
     new msg1[64], msg2[64], name1[MAX_PLAYER_NAME], name2[MAX_PLAYER_NAME], textdraw[41];
     GetPlayerName(playerid, name1, strlen(name1));
     GetPlayerName(playerid, name2, strlen(name2));
     format(msg1, strlen(msg1), "%s has ended %s's killstreak", name2, name1);
     format(msg2, strlen(msg2), "%s is now on a killsreak of %i", name2, killstreak[killerid]);
     format(textdraw, sizeof(textdraw), "%s: %i", name, killstreak[killerid]);
    TextDrawSetString(killstext, newtext);
    TextDrawShowForAll(killstext);
     SendClientMessageToAll(COLOR_CYAN, msg1);
     SendClientMessageToAll(COLOR_CYAN, msg2);
     switch(killstreak[killerid])
     {
          case 3:
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 3 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
          case 4:
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 4 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
          case 5:
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 5 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
          case 6:
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 6 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
          case 7:
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 7 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
          case 8:
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 8 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
          case 9:  //change the numbers as desired and add/remove as many as you want
          {
              new string[64], pName[MAX_PLAYER_NAME];
              GetPlayerName(playerid,pName,MAX_PLAYER_NAME);
              format(string,sizeof string,"%s is now on a Killstreak of 9 Kills.",pName);
              SendClientMessageToAll(COLOR_CYAN,string);
          }
     }
     return 1;
}