Make cURL output STDERR to file (or string)

Question

We\'re trying to debug some cURL errors on the server, and I would like to see the STDERR log. Currently, all we can see for our error is \"error code: 7\" and that we can\'

Answer 1

You are making couple mistakes in your example:

1) you have to call curl_exec() prior to reading from the "verbose log", because curl_setopt() doesn't perform any action, so nothing can be logged prior to the curl_exec().

2) you are opening $curl_log = fopen("curl.txt", 'w'); only for write, so nothing could be read, even after you write to the file and rewind the internal file pointer.

So the correct shortened code should look like:

 $url,
    CURLOPT_VERBOSE         => 1,
    CURLOPT_STDERR          => $curl_log,
    CURLOPT_RETURNTRANSFER  => 1
));

$response = curl_exec($curl);

rewind($curl_log);
$output= fread($curl_log, 2048);
echo "
". print_r($output, 1). "
";
fclose($curl_log);

// ...

?>

NOTE: verbose log could be longer than 2048 bytes, so you could "fclose" the $curl_log after curl_exec() and then read the whole file with for example file_get_contents(). In that case, the point 2) should not be considered as mistake :-)