PHP cURL with authorization

php_curl_authorization.php

<?php
$curl = curl_init();

curl_setopt_array($curl, array(
CURLOPT_URL => $urlAuthComentarios,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_USERAGENT=>'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)',
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => array(
    "authorization: Basic ". base64_encode("$username:$password"),
    "cache-control: no-cache"
    ),
));

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
?>