BTC Exchange Rate Checker - A simple script that is used to check the current exchange rate of Bitcoins (BTC)

btccheck.php

<?php

/*
 * Copyright (c) 2016 William Surgeon (willies952002) <admin@domnian.com>
 * 
 * MIT License:
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
 * Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * BTC Exchange Value Checker
 * 
 * A simple script that is used to check the current exchange rate of Bitcoins (BTC).
 * 
 * You can also supply a number as an argument to check it's value. Defaults to Satashi.
 * Suffix with "btc" to convert from BTC.
 */

$data = file_get_contents("https://api.coindesk.com/v1/bpi/currentprice.json");
$json = json_decode($data);
$time = $json->time->updated;
$currencies = $json->bpi;

echo "Current BTC Exchange Rates as of $time:\n";

$usd = 0;
foreach ( $currencies as $code => $data ) {
    $sym = html_entity_decode($data->symbol);
    $rate = $data->rate_float;
    if ($code == "USD") $usd = $rate;
    echo "BTC -> $code: $sym$rate\n";
}

$val = false;
if (sizeof($argv) > 1) $val = $argv[1];
if ($val) {
    if (endsWith($val, "btc")) {
    	$btc = substr($val, 0, strlen($val) - 3);
    	$bal = $btc * $usd;
    	echo "$btc BTC in USD: $$bal\n";
    } else {
    	$btc = $val / 100000000;
    	$bal = $btc * $usd;
    	echo "$val Satoshi ($btc BTC) in USD: $$bal\n";
    }
}

function endsWith($haystack, $needle) {
    return $needle === "" || (($temp = strlen($haystack) - strlen($needle)) >= 0 && strpos($haystack, $needle, $temp) !== false);
}

?>

sample_output.txt

# php btccheck.php 4605
Current BTC Exchange Rates as of Aug 13, 2016 08:24:00 UTC:
BTC -> USD: $589.0088
BTC -> GBP: £455.8457
BTC -> EUR: €527.634
4605 Satoshi (4.605E-5 BTC) in USD: $0.02712385524