Added Guide for Altcoin ConversionIntroduction:Hello All, Today i am going to tell you how to make your own currency converter using PHP and HTML. I know it seems to be difficult but when you understand it properly, it becomes a small piece of work for you. I will simply use https://bitcoinaverage.com/api to make it work. Let's Go.
Steps to Follow:Kindly follow all the steps and read carefully to understand the meaning of each and every word, so it would be easier to do it yourself.
Step 1 - A Basic HTML Page:First of all, You should create a basic HTML Page like this in any of your text editor:
<html>
<head>
<title>Bitcoin Price Converter</title>
</head>
<body>
</body>
</html>
Now we will put PHP Coding to grab data using API. If you are not aware what is an API, Check this video:
What is an API?Let's start with creating a variable "$url". This variable will be used to grab data from the API Link i.e.
https://api.bitcoinaverage.com/ticker/global/USD/<?php
$url = "https://api.bitcoinaverage.com/ticker/global/USD/";
?>
Once we get our data from the API, We will have to decode it using JSON. Create a variable called $price in which we will store our decoded information.
<?php
$url = "https://api.bitcoinaverage.com/ticker/global/USD/";
$price = json_decode(file_get_contents($url), true);
?>
At this moment we have the API's Information in the variable called $price, It's time to get an exact data which we want i.e. last price. We will create a new variable called $last_price and will store the price in it.
<?php
$url = "https://api.bitcoinaverage.com/ticker/global/USD/";
$price = json_decode(file_get_contents($url), true);
$last_price = $price['last'];
?>
You did it, we got all the data and it's time to show it. Simply use echo function of PHP to output the data:
<?php
$url = "https://api.bitcoinaverage.com/ticker/global/USD/";
$price = json_decode(file_get_contents($url), true);
$last_price = $price['last'];
echo "$last_price";
?>
Now put the PHP Code on the top of the HTML Page we created before like this:
<?php
$url = "https://api.bitcoinaverage.com/ticker/global/USD/";
$price = json_decode(file_get_contents($url), true);
$last_price = $price['last'];
echo "$last_price";
?>
<html>
<head>
<title>Bitcoin Price Converter</title>
</head>
<body>
</body>
</html>
(credit goes to KenR to remind me about this)
Our Converter is ready, we are going to add an auto refresh code to make it display the latest values. Simply add this code:
<meta content='10' http-equiv='refresh'/> <!-- Reloads Page every 10 seconds -->
That's what we get!
<?php
$url = "https://api.bitcoinaverage.com/ticker/global/USD/";
$price = json_decode(file_get_contents($url), true);
$last_price = $price['last'];
echo "$last_price";
?>
<html>
<head>
<title>Bitcoin Price Converter</title>
<meta content='10' http-equiv='refresh'/> <!-- Reloads Page every 10 seconds -->
</head>
<body>
</body>
</html>
Hope this Guide helped you in understanding the concept of API's, Drop me some comments to motivate 
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