Getting size of whole file:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.dsa.da/urfile.rar");
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_exec($ch);
$info = curl_getinfo($ch);
$maxSize =...