the code in config.php of goxgrab is :
// include bitshop config
require_once(dirname(__FILE__).'/../inc/config.inc.php');

// market data API URL
$market_api_url = 'http://api.bitcoincharts.com/v1/weighted_prices.json';

// market used for price data
$currency_market = 'bitstamp'; // (mtgox, btce, bitstamp, etc)

// path to your GoxGrab directory
$goxgrab_path = "goxgrab/"; // include end slash, no start slash

// name of the local ticker file
$json_file = 'btc_markets.json';

// application version
$app_version = '0.1.4';
?>