[New and Clueless]

Spoiler

#include <amxmodx>
#include <fakemeta>

#define MAX_PLAYERS 32

new g_Votes, g_PlayerVoted[MAX_PLAYERS + 1];

new const KillBots[][] = 
{ 
     "say /botkill", "say botkill", "say /bk", "say bk", "say /killbots", "say killbots", "say /botkillvote", "say botkillvote", "say bkv", "say /bkv"
} 

public plugin_init() 
{
for(new i = 0; i < sizeof KillBots; i++) 
     register_clcmd(KillBots[i], "cmd_kill")  
}

public client_disconnect(id)
{
   if(g_PlayerVoted[id])
   {
       g_PlayerVoted[id] = false; g_Votes--;
   }
}

public cmd_kill(id)
{
    new num = get_playersnum();
    new voted = num/5;
    g_Votes++;
    g_PlayerVoted[id] = true;
    if(g_Votes>=voted) kill(num);
    else client_print(0, print_chat, "[BKV] %i/%i players voted to kill all bots!", g_Votes, voted);
}

public kill(num)
{
    for(new id = 1; id<=num;id++)
       if(is_user_bot(id) & is_user_alive(id))
            dllfunc(DLLFunc_ClientKill, id);
}

or you can check original post here.

http://zppv.boards.net/thread/3447/bot-vote