How Can I Debug and Inspect POST Fields in PHP Curl Requests?

Debugging Curl Requests in PHP

When debugging curl requests, it is often necessary to inspect the post fields that are sent with the request. In PHP, curl_setopt() is used to set various options, such as headers, while curl_exec() sends the request.

To view the post fields being sent, one can leverage the CURLOPT_VERBOSE option in conjunction with CURLOPT_STDERR. Enabling CURLOPT_VERBOSE logs verbose information about the request to the provided CURLOPT_STDERR filehandle.

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

After the request has been executed using curl_exec(), the verbose information can be retrieved by reading from the $streamVerboseHandle filehandle.

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

Furthermore, curl_getinfo() can provide additional metrics about the last request, which can be beneficial for debugging purposes.

$version = curl_version();
extract(curl_getinfo($curlHandle));
$metrics = <<<EOD
URL....: $url
Code...: $http_code ($redirect_count redirect(s) in $redirect_time secs)
Content: $content_type Size: $download_content_length (Own: $size_download) Filetime: $filetime
Time...: $total_time Start @ $starttransfer_time (DNS: $namelookup_time Connect: $connect_time Request: $pretransfer_time)
Speed..: Down: $speed_download (avg.) Up: $speed_upload (avg.)
Curl...: v{$version['version']}
EOD;

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