How to download a file to the server bypassing the buffer?

Question

PHP

How to direct a file download from a third-party server directly to a file? at the moment, downloading the file is implemented through CURL, while the file is written in "portions" of 20+ mb. I would like to somehow reduce these "portions", perhaps by somehow limiting the size of the buffer.

$fp = fopen($filename, 'w+');
            $ch = curl_init($url);
            curl_setopt($ch, CURLOPT_FILE, $fp);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($ch, CURLOPT_WRITEFUNCTION, function ($cp, $data) use ($fp) { return fwrite($fp, $data); });
            curl_exec($ch);
            curl_close($ch);
            fclose($fp);

Answer 1

just like you write to a file in your code,
which prevents fopen from requesting the file and specifying the url in $filename