Bitcoin PHP currency converter

[BitDave]

I want to accept bitcoins on my ecommerce site for payment of goods. I'll accept them manually for now, generating an address for each customer, but as a minimum I need to display the visitor's checkout total in both USD and bitcoins. Is there a way of getting data from a server on what the current bitcoin exchange rate is via PHP?

[BCB]

Code:

function mtgox_query($path, array $req = array()) {
	$key = 'xxx';                                   //from your mt. gox account
	$secret = 'xxxx';				//from your mt. gox account						
	$mt = explode(' ', microtime());
	$req['nonce'] = $mt[1].substr($mt[0], 2, 6);
	$post_data = http_build_query($req, '', '&');
	$headers = array(
		'Rest-Key: '.$key,
		'Rest-Sign: '.base64_encode(hash_hmac('sha512', $post_data, base64_decode($secret), true)),
	);

	static $ch = null;
	if (is_null($ch)) {
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MtGox PHP client; '.php_uname('s').'; PHP/'.phpversion().')');
	}
	curl_setopt($ch, CURLOPT_URL, 'https://mtgox.com/api/'.$path);
	curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
	curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

	curl_setopt($ch, CURLINFO_HEADER_OUT, true);	
	$res = curl_exec($ch);
	
	if ($res === false) throw new Exception('Could not get reply: '.curl_error($ch));
	$dec = json_decode($res, true);


	
	if (!$dec) throw new Exception('mtgox_query');
	return $dec;
}

//call the method from (https://en.bitcoin.it/wiki/MtGox/API/HTTP/v1) using the function.
$mt_gox = mtgox_query('1/BTCUSD/ticker');


//out put the value.
echo $mt_gox['return']['last']['value'];

//this will dump all the values being returned from this call.
echo '<pre>' . print_r($mt_gox,true) . '</pre>';

[BCB]

You could also be using

Code:

function JSONtoAmount($value) {
    return round($value * 1e8);
}

to convert floats and avoid rounding errors.

This is explained here.

https://en.bitcoin.it/wiki/Proper_Money_Handling_(JSON-RPC)

[BCB]

You could also be using

Code:

function JSONtoAmount($value) {
    return round($value * 1e8);
}

to convert floats and avoid rounding errors.

or just use the mount gox "value_int" value and convert to decimal for display.

This is explained here.

https://en.bitcoin.it/wiki/Proper_Money_Handling_(JSON-RPC)

[alexanderrrr]

Thanks for the codesnippets. Useful.

[svirus]

From php 5.0.0 you can change this

Code:

        $mt = explode(' ', microtime());
	$req['nonce'] = $mt[1].substr($mt[0], 2, 6);

to

Code:

         $req['nonce'] = microtime(true);