PHP curl_setopt() CURLOPT_PROGRESSFUNCTION

Question

i see in the curl_setopt() documentation that you can set a callback function to display the progress of a curl_exec. There\'s not much said on how the callback function is

Answer 1

This is how the callback looks in C:

typedef int (*curl_progress_callback)(void *clientp,
                                      double dltotal,
                                      double dlnow,
                                      double ultotal,
                                      double ulnow);

Probably in PHP it should look like

curl_progress_callback($clientp, $dltotal, $dlnow, $ultotal, $ulnow)

I suppose that dl stands for download and ul for upload.

Answer 2

You get a full example on the curl website at:

http://curl.haxx.se/libcurl/c/curlgtk.html

More complete PHP answer here: cURL Download Progress in PHP not working?