PHP & cURL proxy - how to make multi-user cookie jar?
Your question has every element of a solution, namely cookie jar and sessions.
When you provide the cookie jar file to CURL simply give it a name according to your user, example:
$protected_cookie_dir='/cookies/';$uid=getUser()->id; // get the user idcurl_set_opt($ch,CURLOPT_COOKIEFILE,$protected_cookie_dir.'file_'.$uid.'.data');curl_set_opt($ch,CURLOPT_COOKIEJAR,$protected_cookie_dir.'jar_'.$uid.'.data');Important: Be sure to hide that folder (maybe store it outside your document root).