private var playerCount : int = 0;

function OnPlayerConnected(player: NetworkPlayer) {
Debug.Log("Player " + playerCount +
" connected from " + player.ipAddress +
":" + player.port);
// Populate a data structure with player information ...
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
private int playerCount = 0;
void OnPlayerConnected(NetworkPlayer player) {
Debug.Log("Player " + playerCount + " connected from " + player.ipAddress + ":" + player.port);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

private playerCount as int = 0

def OnPlayerConnected(player as NetworkPlayer):
Debug.Log(((((('Player ' + playerCount) + ' connected from ') + player.ipAddress) + ':') + player.port))