[FUNCTION] gpci

native gpci ( playerid, serial [ ], maxlen );
#include <a_samp>
static SERIAL[MAX_PLAYERS][25];

public OnPlayerConnect(playerid){
    MaxUser(playerid);
    return true;
}
stock MaxUser(playerid){
    gpci(playerid,SERIAL[playerid],24);
    for(new player, user = GetMaxPlayers(); player != user; player++){
        if(IsPlayerConnected(player) && (player!=playerid)){
            if(!strcmp(SERIAL[playerid], SERIAL[player], true, 24)){Kick(playerid);} }
    } return true;
}