How to get RealTime stock price using yahoo finance

Question

I have several requirement which are listed below.

1. Get Real Time stock price without page refresh or ajax. (ie. yahoo finance, they get latest stock price without page refresh and ajax call)
2. Get stock price from as much as stock market like BSE, NSC etc..

Right now using following code i am able to get stock price but either i have to refresh the page or call to ajax and in both case it take 20 to 30 seconds but in many finance site they can update price by each second without using ajax.

<?php
/**
 * Class to fetch stock data from Yahoo! Finance
 *
 */

    class YahooStock {

        /**
         * Array of stock code
         */
        private $stocks = array();

        /**
         * Parameters string to be fetched  
         */
        private $format;

        /**
         * Populate stock array with stock code
         *
         * @param string $stock Stock code of company   
         * @return void
         */
        public function addStock($stock)
        {
            $this->stocks[] = $stock;
        }

        /**
         * Populate parameters/format to be fetched
         *
         * @param string $param Parameters/Format to be fetched
         * @return void
         */
        public function addFormat($format)
        {
            $this->format = $format;
        }

        /**
         * Get Stock Data
         *
         * @return array
         */
        public function getQuotes()
        {       
            $result = array();     
            $format = $this->format;

            foreach ($this->stocks as $stock)
            {           
                /**
                 * fetch data from Yahoo!
                 * s = stock code
                 * f = format
                 * e = filetype
                 */
                $s = file_get_contents("http://finance.yahoo.com/d/quotes.csv?s=$stock&f=$format&e=.csv");

                /**
                 * convert the comma separated data into array
                 */
                $data = explode( ',', $s);

                /**
                 * populate result array with stock code as key
                 */
                $result[$stock] = $data;
            }
            return $result;
        }
    }
    $objYahooStock = new YahooStock;

    /**
        Add format/parameters to be fetched

        s = Symbol
        n = Name
        l1 = Last Trade (Price Only)
        d1 = Last Trade Date
        t1 = Last Trade Time
        c = Change and Percent Change
        v = Volume
     */
    $objYahooStock->addFormat("snl1d1t1cv");

    /**
        Add company stock code to be fetched

        msft = Microsoft
        amzn = Amazon
        yhoo = Yahoo
        goog = Google
        aapl = Apple   
     */
    $objYahooStock->addStock("msft");
    $objYahooStock->addStock("amzn");
    $objYahooStock->addStock("yhoo");
    $objYahooStock->addStock("goog");
    $objYahooStock->addStock("vgz");
    $objYahooStock->addStock("FB");
    /**
     * Printing out the data
     */
    ?>
    <table width="100%">
    <tr>
        <th>Row</th>
        <th>Code</th>
        <th>Name</th>
        <th>Last Trade Price</th>
        <th>Last Trade Time</th>
        <th>Change and Percent Change</th>
        <th>Volume</th>
    </tr>
    <?php
    foreach( $objYahooStock->getQuotes() as $code => $stock)
    {
        ?>
        <tr>
            <td><?php //print_r($stock); ?></td>
            <td><?php echo $stock[0]; ?></td>
            <td><?php echo $stock[1]; ?></td>
            <td><?php echo $stock[2]; ?></td>
            <td><?php echo $stock[3]; ?></td>
            <td><?php echo $stock[4]; ?></td>
            <td><?php echo $stock[5]; ?></td>
            <td><?php echo $stock[6]; ?></td>
        </tr>

        <?php
    }
?>
    </table>

Solution 1

<?php

class U_Yahoo{

    private function file_get_contents_curl($url) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_HEADER, 0);

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        curl_setopt($ch, CURLOPT_URL, $url);

        $data = curl_exec($ch);
        curl_close($ch);

        return $data;
    }

    //return the history quote from the simbol, default begin date is 90 day ago, the default end is today
    public function getHistoryQuote($symbol, $begin = 90, $end = 0){
        if(!$begin && !$end)
            $begin = $end = 0;

        $begin = Date('Y-m-d', strtotime("-{$begin} days"));
        $end = Date('Y-m-d', strtotime("-{$end} days"));
        $url = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.historicaldata%20where%20symbol%20%3D%20%22$symbol%22%20and%20startDate%20%3D%20%22$begin%22%20and%20endDate%20%3D%20%22$end%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=";
        $jason_obj = json_decode( $this->file_get_contents_curl($url) );
        return $jason_obj->query->results->quote;
    }

    //return not just the quote but others informations too
    public function getCurrentData($symbol){
        $is_array = is_array($symbol);

        $imp_symbol = ($is_array)? implode('%22%2C%22', $symbol) : $symbol;

        $url = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quote%20where%20symbol%20in%20(%22$imp_symbol%22)&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=";
        $jason_obj = json_decode( $this->file_get_contents_curl($url) );

        $result = $jason_obj->query->results->quote;

        return (is_array($symbol) and (count($symbol) == 1))? [$result] : $result;
    }

    //return all quotes from the param $symbol passed, if symbol is array, it will return other array indexed by the symbols
    public function getCurrentQuote($symbol){
        if(is_array($symbol)){
            $symbol = empty($symbol)? ['GOOG'] : $symbol;
            $data = $this->getCurrentData($symbol);
            $result = [];

            for ($c = 0; $c < count($data); $c++) { 
                $result[$data[$c]->Symbol] = $data[$c]->LastTradePriceOnly;
            }

            return $result;
        }else
            return $this->getCurrentData($symbol)->LastTradePriceOnly;
    }

}

How use:

$yahoo = new U_Yahoo();
var_dump( $yahoo->getCurrentQuote('GOOG') );
var_dump( $yahoo->getCurrentQuote(['GOOG', 'YHOO']) );

var_dump( $yahoo->getCurrentData(['GOOG', 'YHOO']) );

var_dump( $yahoo->getHistoryQuote('YHOO', 20, 0) );

Solution 2

check this web this may be what you want(Use it for realtime web application)

http://express-io.org/

http://socket.io/

Tutorials

http://blog.nodeknockout.com/post/34243127010/knocking-out-socket-io

Solution 3

well, in your approach, the stock price fetching is triggered by the client (the user's browser). So there is no way to trigger it outside page refresh or AJAX.

However, your server could fetch those data, irrespective of users. Something like:

data source <----> your backend server fetching the data ---> your database <---- your frontend web server <---> users

Backend and frontend servers can be the same server but with different processes.

Solution 4

As far as google is concerned I am pretty sure that the API is deprecated and is not working anymore. you can probably use Yahoo finance api, They have api for csv downloads and via yql.

Refer: https://code.google.com/p/yahoo-finance-managed/wiki/YahooFinanceAPIs

As far as realtime is conecrned, I suggest look at yahoo web services. Following is an example: http://finance.yahoo.com/webservice/v1/symbols/ITC.NS,ITC.BO/quote?format=json If you do not provide format, it will return a XML.

How would you make it realtime without refreshing or Ajax?

You can create a pubsub model and make your application subscribe to your application, you will have to create this layer since the yahoo api is pull based and not push based. So you will need to pull stock quotes from yahoo and push them to your application. You can probably use JMS for java or sockets, whichever suits you.

View more solutions

Comments

[Dipen]

it's just demo and that's why it's looks like this. i can use this code from ajax too but i don't want to use ajax also (you can see this in my requirement).