cotacao2.php

<?php

$arr = Array();
$arr2 = Array("Compra: ", "Venda: ");
$url = "http://www4.bcb.gov.br/pec/taxas/batch/taxas.asp?id=txdolar";
$expRegular = "/[0-9],[0-9]{4}|[0-9],[0-9]{3}/";

$initCurl = curl_init($url);
curl_setopt($initCurl, CURLOPT_HEADER, 0);
curl_setopt($initCurl, CURLOPT_RETURNTRANSFER, 1);
$resultado = curl_exec($initCurl);

preg_match_all($expRegular, $resultado, $arr);

for ($i = 0; $i < count($arr[0]); $i += 1) {
  echo "<b>" . $arr2[$i] . "</b>" . $arr[0][$i] . "<br />";
}

curl_close($initCurl);

// curl http://www4.bcb.gov.br/pec/taxas/batch/taxas.asp?id=txdolar | grep -oie [0-9],[0-9][0-9][0-9][0-9]
?>