How to debug Curl with PHP?

Sometimes, we want to debug Curl with PHP.

In this article,, we’ll look at how to debug Curl with PHP.

How to debug Curl with PHP?

To debug Curl with PHP, we set the CURLOPT_VERBOSE option to true.

For instance, we write

curl_setopt($curlHandle, CURLOPT_VERBOSE, true);

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

to set CURLOPT_VERBOSE to true with curl_setopt to output verbose information.

Then we get the errors with

$result = curl_exec($curlHandle);
if ($result === false) {
    printf(
        "cUrl error (#%d): %s<br>\n",
        curl_errno($curlHandle),
        htmlspecialchars(curl_error($curlHandle))
    );
}

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

to check if $result is false.

If it is, then we get the error with curl_errno and curl_error.

We get the log with stream_get_contents called with $streamVerboseHandle.

Conclusion

To debug Curl with PHP, we set the CURLOPT_VERBOSE option to true.