wordpress codings

add_filter( 'wc_price', 'my_custom_price_format', 10, 3 );
function my_custom_price_format( $formatted_price, $price, $args ) {
 

    ## Bitcoin
    $rate_source = 'CoinDesk';
    // The currency conversion custom calculation function
    $price_btc = $price*0.00016; // WCR_Bitcoin_Exchange_Rate::get( $price, 'USD', 'BTC', $rate_source );
    // the currency symbol for BTC
    $currency_symbol = '<i class="cc BTC"></i> ';
    $price_btc = $currency_symbol.$price_btc; // adding currency symbol
    //Bitcoin formattd price
    $formatted_price_btc = "<br><span class='price-btc'> $price_btc</span>";

    ## USD (formatted price)
    $formatted_price = '<br>('.$formatted_price .')';

    // Return the 2 formatted currencies
    return $formatted_price_btc . $formatted_price ;
}

$price_btc = $price*0.00016; // WCR_Bitcoin_Exchange_Rate::get( $price, 'USD', 'BTC', $rate_source );

 $price_btc = WCR_Bitcoin_Exchange_Rate::get( $price, 'USD', 'BTC', $rate_source );