How Can I Debug cURL POST Fields in PHP?

Debugging Curl Post Fields in PHP

When debugging HTTP requests, inspecting the post fields can be crucial. PHP's curl library provides options to enable verbose output and retrieve request information, making it possible to examine these fields before sending the request.

To enable verbose logging, set the CURLOPT_VERBOSE option to true and redirect the output to a file or stream. This will generate a detailed log of the request, including the post fields. Here's an example:

// Enable verbose output
curl_setopt($curlHandle, CURLOPT_VERBOSE, true);

// Redirect output to a stream
$streamVerboseHandle = fopen('php://temp', 'w+');
curl_setopt($curlHandle, CURLOPT_STDERR, $streamVerboseHandle);

After sending the request, you can read the verbose log to inspect the post fields:

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

echo "cUrl verbose information:\n",
     "<pre class="brush:php;toolbar:false">", htmlspecialchars($verboseLog), "

\n";

Additionally, curl_getinfo provides detailed metric information about the last request, which can also be useful for debugging. Here's an example of extracting relevant information:

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.)
EOD;

By leveraging these techniques, you can effectively debug Curl requests, including examining post fields and extracting request metrics for further analysis.

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