Recuperar o dólar turismo e comercial do site: http://www.valor.com.br/valor-data

dolar.php

<?php

function getDolar() {
    function normalize($dolar_string) {
        preg_match('/<strong>(.*?)<\/strong>/', $dolar_string, $matches);
        preg_match_all('/<span.*?>(.*?)<\/span>/', $dolar_string, $out);
        preg_match_all('/<span.*? class="variation (.*?)">/', $dolar_string, $style);
        $kind_dolar = trim(str_replace(array('.', 'DÓLAR'), array('',''), $matches[1]));
        $ret = array(
            $kind_dolar => array('value' => $out[1][0],
                                 'variation' => $out[1][1],
                                 'class' => $style[1][0])
        );
        return $ret;
    }

    $source = file_get_contents('http://www.valor.com.br/valor-data');
    $source = str_replace("\n", "", $source);
    preg_match_all('/<div class="item">(.*?)<\/div>/',
                    $source,
                    $out, PREG_PATTERN_ORDER);

    $dolar_com = $out[0][0];
    $dolar_tur = $out[0][1];

    $dolar_com = normalize($dolar_com);
    $dolar_tur = normalize($dolar_tur);

    $dolar = array_merge($dolar_com, $dolar_tur);

    return $dolar;
}

$dolar = getDolar();
print_r($dolar);
?>