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Last active Feb 26, 2018

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BOC Exchange Rate Monitor (AUD/CNY)

Demo: https://labs.1a23.com/rate

simple_html_dom.php is available at http://sourceforge.net/projects/simplehtmldom/ (MIT License)

Requires a SQLite database data.db with structure:

CREATE TABLE data (
  time text PRIMARY KEY NOT NULL,
  value double(128) NOT NULL
);
CREATE UNIQUE INDEX timeindex ON data (time ASC);
CREATE TABLE meta (
  "key" varchar PRIMARY KEY NOT NULL,
  value varchar(128)
);

Requires a Telegram Bot for reminders.

Requires server to setup a cronjob to run data.php every minute for data update.

<?php
require_once( 'simple_html_dom.php' );
/**
*Retrieve info from boc website using simple html dom.
*
*Simple Html Dom Parser document and download: http://simplehtmldom.sourceforge.net/
*/
function get_boc_exchange_rate_table(){
//Get web page by simple html dom parser
$html = file_get_html( 'http://www.boc.cn/sourcedb/whpj/enindex.html' );
//Control the items in the currency list.
$allowed_currency = array( 'TWD', 'GBP', 'HKD', 'USD', 'CHF', 'SGD', 'SEK', 'DKK', 'NOK', 'JPY', 'CAD', 'AUD', 'MYR', 'EUR', 'MOP', 'PHP', 'THB', 'NZD', 'KRW', 'RUB' );
//Stores the final data
$exchange_rates = array();
foreach( $html->find('table tr[align=center]') as $tr ){
$currency_name = $tr->children(0)->plaintext;
if( in_array( $currency_name, $allowed_currency ) ){
$exchange_rates[ $currency_name ]['currency_name'] = $currency_name;
$exchange_rates[ $currency_name ]['buying_rate'] = $tr->children(1)->plaintext;
$exchange_rates[ $currency_name ]['cash_buying_rate'] = $tr->children(2)->plaintext;
$exchange_rates[ $currency_name ]['selling_rate'] = $tr->children(3)->plaintext;
$exchange_rates[ $currency_name ]['cash_selling_rate'] = $tr->children(4)->plaintext;
$exchange_rates[ $currency_name ]['middle_rate'] = $tr->children(5)->plaintext;
$exchange_rates[ $currency_name ]['pub_time'] = str_replace("&nbsp;", '',$tr->children(6)->plaintext);
try {
$datetime = new DateTime( $exchange_rates[ $currency_name ]['pub_time'] );
} catch( Exception $e ){
echo $e->getMessage();
}
$exchange_rates[ $currency_name ]['pub_time'] = $datetime->format('Y-m-d H:i:s');
}
}
return $exchange_rates;
}
<?php
require_once('bocrate.php');
$data = get_boc_exchange_rate_table();
$m = ['', number_format($data['AUD']['selling_rate'], 2)];
$n = ['', $data['AUD']['pub_time']];
if ($m[1] == "0.00") exit(0);
$s = new PDO('sqlite:data.db');
$s->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// NOTE: Date format is YYYY-MM-DD HH:MM:SS
// 0, 13 means YYYY-MM-DD HH, for the same line-crossing, sends only one reminder per hour.
$today = substr($n[1], 0, 13);
$last_val = floatval($s->query('SELECT * FROM data ORDER BY time DESC LIMIT 1')->fetch(PDO::FETCH_ASSOC)['value']);
// NOTE: `/ 10` means prompt for changes every 10 cents.
$last_k_val = floor(intval($last_val) / 10);
$k_val = floor(intval(floatval($m[1])) / 10);
if ($last_k_val - $k_val != 0){ // crossing border
$border = max($last_k_val, $k_val);
$db_date = $s->query('SELECT * FROM meta where key = "last_alarm_date"')->fetch(PDO::FETCH_ASSOC)['value'];
$db_border = intval($s->query('SELECT * FROM meta where key = "last_alarm_value"')->fetch(PDO::FETCH_ASSOC)['value']);
if ($db_date != $today or $db_border != $border){
if ($last_k_val < $k_val) $type = "📈"; else $type = "📉";
$now = $m[1];
// Message format.
$msg = "BOCAUD $last_val $type $now\n\n汇率变动提醒\n中国银行 AUD/CNY 现汇卖出价";
// TODO: Fill bot token here
$url = "https://api.telegram.org/botBOT_TOKEN_GOES_HERE/sendMessage";
$chat_id = 0; // TODO: fill chat ID here.
$fields = "chat_id=$chat_id&text=" . urlencode($msg);
$ch = curl_init( $url );
curl_setopt( $ch, CURLOPT_POST, 1);
curl_setopt( $ch, CURLOPT_POSTFIELDS, $fields);
curl_exec( $ch );
curl_close($ch);
$s->prepare("UPDATE meta SET value = :date WHERE key = \"last_alarm_date\"")->execute(["date"=>$today]);
$s->prepare("UPDATE meta SET value = :border WHERE key = \"last_alarm_value\"")->execute(["border"=>$border]);
}
}
$q2 = $s->prepare('SELECT * FROM data WHERE time = :time');
$q2->execute(["time"=>$n[1]]);
if (!boolval($q2->fetch())){
$q = $s->prepare('INSERT INTO data (time, value) VALUES (:time, :value)');
$q->execute(["time"=>$n[1], "value"=>floatval($m[1])]);
if ($q->rowCount() > 0) exit("Done.");
exit("Failed.");
} else {
exit("Exist.");
}
<?php
$s = new PDO('sqlite:data.db');
$s->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$q2 = $s->prepare('SELECT * FROM data ORDER BY time DESC LIMIT 5000');
$q2->execute();
$data = json_encode($q2->fetchAll(PDO::FETCH_ASSOC));
?><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>BankOfChina AUD/CNY</title>
<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400" rel="stylesheet">
<link rel="stylesheet" href="https://fonts.googleapis.com/earlyaccess/notosanssc.css">
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<script src="https://code.highcharts.com/stock/modules/exporting.js"></script>
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<meta name="theme-color" content="#2196F3">
</head>
<body>
<style>
html, body{
margin: 0;
padding: 0;
bottom: 0;
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.card{
display: flex;
align-items: stretch;
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span.block{
display: inline-block;
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.card{
position: absolute;
top: 5vh;
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left: 5vh;
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font-size: 15pt;
box-shadow: 0 0 5px rgba(0,0,0,0.3), 0 10px 20px rgba(0,0,0,0.3);
-webkit-flex-direction: row;
-moz-flex-direction: row;
-ms-flex-direction: row;
-o-flex-direction: row;
flex-direction: row;
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padding-top: 2em;
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flex-basis: 33%;
display: flex;
flex-direction: column;
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flex-grow:1;
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<div class="card">
<div class="title">
<div class="heading">
<div class="heading-small">中国银行*</div>
<div class="heading-large"><span class="block">AUD/CNY</span> <span class="block">现汇卖出价</span></div>
</div>
<div class="value" id="value">
123.45
</div>
<div class="attribute">* Footnote goes here。</div>
</div>
<div class="graph" id="graph-container">
</div>
</div>
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var rdata = <?php echo $data ?>;
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data.push([new Date(rdata[i].time).valueOf(), parseFloat(rdata[i].value)]);
}
document.getElementById('value').innerText = data[data.length - 1][1];
window.last_date = data[data.length - 1][0];
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month: '%Y-%m-%d %H:%M:%S',
year: '%Y-%m-%d %H:%M:%S',
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data: data,
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tooltip: {
valueDecimals: 2
},
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</body>
</html>
<?php
$s = new PDO('sqlite:data.db');
$s->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
header("Content-type: application/json");
echo json_encode($s->query('SELECT * FROM data ORDER BY time DESC LIMIT 1')->fetch(PDO::FETCH_ASSOC));
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