Here's a version with the v2 API
$tuCurl = curl_init();
curl_setopt($tuCurl, CURLOPT_URL, "https://data.mtgox.com/api/2/BTCUSD/money/ticker");
curl_setopt($tuCurl, CURLOPT_PORT , 443);
curl_setopt($tuCurl, CURLOPT_HEADER, 0);
curl_setopt($tuCurl, CURLOPT_RETURNTRANSFER, true);
$tuData = curl_exec($tuCurl);
$obj = json_decode($tuData);
$averagePrice = $obj->data->avg->value;
$lastPrice = $obj->data->last->value;
echo $averagePrice."\n";
echo $lastPrice."\n";