gistfile1.txt

 $bytesCopied = stream_copy_to_stream($source, $target);
            fclose($source);
            fclose($target);
            unset($source, $target);

            if (!is_file($targetFile)) {
                throw new Exception('');
            }

            if($bytesCopied !== filesize($originFile)){
                throw new Exception('');
            }