Curl verbose Facebook api test

test.php

<?php

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, "https://graph.facebook.com/v2.12/oauth/access_token");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "postvar1=value1&postvar2=value2&postvar3=value3");

curl_setopt($ch, CURLOPT_VERBOSE, true);

curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($ch, CURLOPT_TIMEOUT, 5);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$verbose = fopen('php://temp', 'w+');
curl_setopt($ch, CURLOPT_STDERR, $verbose);

$server_output = curl_exec($ch);

rewind($verbose);
$verboseLog = stream_get_contents($verbose);


echo "<pre>";
var_dump($server_output);

echo "Verbose information:\n<pre>", htmlspecialchars($verboseLog), "</pre>\n";
curl_close($ch);