function download_stock_data_history_by_symbol($stock_symbol)
{
$year = date('Y');
$day = intval(date('d'));
$month = intval(date('m')) - 1;
$historical_stock_data_link_format = 'http://real-chart.finance.yahoo.com/table.csv?s=%s&a=%s&b=%s&c=2013&d=%s&e=%s&f=%s&g=d&ignore=.csv';
$link = sprintf($historical_stock_data_link_format, $stock_symbol, $day, $month, $day, $month, $year);
$historical_stock_data = file_get_contents($link);
// Header row of file
// Date,Open,High,Low,Close,Volume,Adj Close,Symbol
$symbol_included_historical_stock_data = str_replace("\n", ",{$stock_symbol}\n", $historical_stock_data);
$historical_stock_data_directory = get_data_subdirectory('historical_data');
ensure_directory_exists($historical_stock_data_directory);
$historical_stock_data_filename = $stock_symbol . '.csv';
$filepath = $historical_stock_data_directory . $historical_stock_data_filename;
file_put_contents($filepath, $symbol_included_historical_stock_data);
}
/**
* Created by PhpStorm.
* User: cloudera
* Date: 1/19/16
* Time: 3:04 PM
*/
function get_price_delta_since_date($since_date, $symbol)
{
$file_path = get_data_subdirectory('historical_data') . '/' . $symbol . '.csv';
$stock_data = file_get_contents($file_path);
$stock_data_as_array = explode("\n", $stock_data);
$latest_date_data = $stock_data_as_array[1];
$latest_stock_day_data = explode(',', $latest_date_data);
$latest_price = $latest_stock_day_data[4];
$since_price = 0;
foreach ($stock_data_as_array as $stock_day_data_as_string) {
$stock_day_data = explode(',', $stock_day_data_as_string);
$date = $stock_day_data[0];
if ($date == $since_date) {
$since_price = $stock_day_data[4];
break;
}
}
return floatval($latest_price) - floatval($since_price);
}
<?php
include './utility.php';
ensure_data_directory_exists();
$nyse_download_link = "http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange=NYSE&render=download";
$nasdaq_download_link = "http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange=NASDAQ&render=download";
$listings_dir = get_data_subdirectory('listings');
ensure_directory_exists($listings_dir);
$data = file_get_contents($nyse_download_link);
file_put_contents($listings_dir . "nyse.csv", $data);
$data = file_get_contents($nasdaq_download_link);
file_put_contents($listings_dir . "nasdaq.csv", $data);