cURL download progress in PHP

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 show how much of it is loaded. So far I have successfully downloaded the source without showing the loading progress. Can you explain how to show the download progress? Without cURL I would read the file byte by byte and divide the total amount of downloaded bytes with the total size of the file. How can this be done in cURL since it reads the source as a whole? (at least I think that this is the only way, not sure) Here’s what I’ve got so far:

/* Download source */
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $adress);  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, 0); 
curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
echo curl_getinfo($ch, CURLINFO_TOTAL_TIME);
$html = curl_exec($ch);
curl_close($ch); 

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