cURL download progress in PHP

Question

I\'m pretty new to cURL so I\'ve been struggling with this one for hours. I\'m trying to download the source of a website in an iframe using cURL and while it\'s loading to

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)

So, assuming you have page.html which loads a .php file in an iframe.

In your php script, you will require the following functions:

curl_setopt($curl, CURLOPT_PROGRESSFUNCTION, 'curl_progress_callback');    
curl_setopt($curl, CURLOPT_BUFFERSIZE,64000);    
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);

which should produce an output similar to the following:

0
0.1
0.2
0.2
0.3
0.4
...

then on the iframe page, you will have a progress bar

    
0%

CSS would be something like this

#progress-bar {
    width: 200px;
    padding: 2px;
    border: 2px solid #aaa;
    background: #fff;
}

#progress {
    background: #000;
    color: #fff;
    overflow: hidden;
    white-space: nowrap;
    padding: 5px 0;
    text-indent: 5px;
    width: 0%;
}

The javascript

var progressElement = document.getElementById('progress')

function updateProgress(percentage) {
    progressElement.style.width = percentage + '%';
    progressElement.innerHTML = percentage + '%';
}

You can have it output JavaScript and have it update the progress bar for you, for example:

You might be interested in some more example code