Google Finance API调用中JSON中的前导斜杠 [英] Leading slashes in JSON from Google Finance API call

问题描述

我一直在使用Google Finance API成功收集一些股票信息.问题在于，在调用http://www.google.com/finance/info?infotype=infoquoteall&q=[$tickerSymbol]之后，Google返回的JSON之前已添加//，因此无法使用PHP的json_encode()对该字符串进行编码. JSONLint JSON验证器确认//无效.显而易见的解决方法是从JSON开头去除斜线.但是，我不知道为什么Google会在其返回的JSON中添加斜杠.多余的斜线后面有目的吗?当其他语言只会忽略多余的字符时，这是否与PHP的json_encode()怪异?我做错了什么吗?

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?

这是一个要求http://www.google.com/finance/info?infotype=infoquoteall&q=AAPL带有正斜杠的结果的示例.

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"
}
]

推荐答案

对于那些正在寻找现成答案的人，这是一个使用PHP的有效示例； JSON被清理并转换为对象.可以轻松提取值.

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.

第二个只是为了使其更出色，它会在访问页面时向您的PubNub频道发送一条推送消息(cron是您的朋友).可以很容易地通过javascript接收PubNub消息，因此是实时的...

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
?>

当然，如果您始终需要实时更新，则有更好的选择.我只是想每30分钟/60分钟更新一次.

of course if you need something live updating all the time there are better options. I was just looking to update every 30min/60min.

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