public function getCurrencyConversion($currency = 'USD'){

        $content = file_get_contents("http://br.financas.yahoo.com/q?s={$currency}BRL=X");
        preg_match('/<span id=\"yfs_p20_'. strtolower($currency) .'brl=x\">(.*)<\/span>/', $content, $matches, PREG_OFFSET_CAPTURE);
        preg_match('/<span id=\"yfs_b00_'. strtolower($currency) .'brl=x\">(.*)<\/span>/', $content, $matches2, PREG_OFFSET_CAPTURE);
        preg_match('/<span id=\"yfs_a00_'. strtolower($currency) .'brl=x\">(.*)<\/span>/', $content, $matches3, PREG_OFFSET_CAPTURE);
        $variation = substr($matches[0][0], 29, 29);
        $buyPrice = substr($matches2[0][0], 28, 9);
        $sellPrice = substr($matches3[0][0], 28, 9);
        $currencyVariation = preg_replace('/\)/', '', $variation);


        echo <<<CURRENCY

        <td><strong>{$currency}</strong></td>
        <td>$buyPrice</td>
        <td>$sellPrice</td>
        <td class="green"><strong>$currencyVariation</strong></td>
CURRENCY;


    }