Leading slashes in JSON from Google Finance API call - php

Question

I've been using the Google Finance API to successfully gather some stock info. The problem is that after a call to http://www.google.com/finance/info?infotype=infoquoteall&q=[$tickerSymbol], the JSON that Google returns has // added before it and therefore the string cannot be encoded using PHP's json_encode(). The JSONLint JSON Validator confirms that the //s are not valid. The obvious workaround is to strip the slashes from the beginning of the JSON. None-the-less, I am left wondering why Google is adding slashes to the JSON it is returning. Is there a purpose behind the extra slashes? Is this a quirk with PHP's json_encode() when other languages would simply ignore the extra characters? Am I doing something incorrectly?
Here is an example of the result of a request for http://www.google.com/finance/info?infotype=infoquoteall&q=AAPL with the leading slashes.
// [ {
"id": "22144"
,"t" : "AAPL"
,"e" : "NASDAQ"
,"l" : "340.65"
,"l_cur" : "340.65"
,"ltt":"4:00PM EST"
,"lt" : "Jan 18, 4:00PM EST"
,"c" : "-7.83"
,"cp" : "-2.25"
,"ccol" : "chr"
,"el": "345.20"
,"el_cur": "345.20"
,"elt" : "Jan 18, 5:45PM EST"
,"ec" : "+4.55"
,"ecp" : "1.34"
,"eccol" : "chg"
,"div" : ""
,"yld" : ""
,"eo" : ""
,"delay": ""
,"op" : "327.05"
,"hi" : "344.76"
,"lo" : "326.00"
,"vo" : "66.34M"
,"avvo" : "11.28M"
,"hi52" : "348.48"
,"lo52" : "190.25"
,"mc" : "313.75B"
,"pe" : "22.49"
,"fwpe" : ""
,"beta" : "1.38"
,"eps" : "15.15"
,"name" : "Apple Inc."
,"type" : "Company"
}
]

Answer 1

For those looking for a ready answer, here is a working example with PHP; The JSON is cleaned and transformed into an object. Values can easily be extracted.
The second is just to make it more awesome, it sends a push message you a PubNub channel when page is accessed (cron is your friend). PubNub message can easily be received via javascript hence live...
<?php
//Obtain Quote Info
$quote = file_get_contents('http://finance.google.com/finance/info?client=ig&q=INDEXDB:DAX');
//Remove CR's from ouput - make it one line
$json = str_replace("\n", "", $quote);
//Remove //, [ and ] to build qualified string
$data = substr($json, 4, strlen($json) -5);
//decode JSON data
$json_output = json_decode(utf8_decode($data));
// get the last price
$last = $json_output->l;
//Output Stock price .
echo 'DAX: ' . $last;
//////////////////////////////
// send it through pubnub //
//////////////////////////////
require_once('Pubnub.php');
// Publish and Subscribe Keys
$publish_key = 'demo';
$subscribe_key = 'demo';
$subscribe_key = false;
// Create Pubnub Object
$pubnub = new Pubnub( $publish_key, $subscribe_key, $secret_key );
// Publish !
$channel = 'quoteTheDax';
$timestamp = $pubnub->time();
$pubish_success = $pubnub->publish(array(
'channel' => $channel,
'message' => array("last" => $last2, "ts" => $timestamp)
));
//Boom its send to ppl subscribed to this channel arround the world
?>
of course if you need something live updating all the time there are better options. I was just looking to update every 30min/60min.

Answer 2

I guess it's because google don't want you to work with that JSON, they recommend to use the Google Data API.