[mongi]

PHP код:

    for(new i=0; i<MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i))
        {
            if(/*Your code to check if the player is admin*/)
            {
                SendClientMessage(i, 0xBD0000FF, elc_str);
            }
        }
    } 


Easy and simple way.