miarau / rssfeed

                $input = '/';

            }

            // C: if the input buffer begins with a prefix of "/../" or "/..", where ".." is a complete path segment, then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise,

            elseif (strpos($input, '/../') === 0)

            {

                $input = substr($input, 3);

                $output = substr_replace($output, '', strrpos($output, '/'));

            }

            elseif ($input === '/..')

            {

                $input = '/';

                $input = '';

            }

            // E: move the first path segment in the input buffer to the end of the output buffer, including the initial "/" character (if any) and any subsequent characters up to, but not including, the next "/" character or the end of the input buffer

            elseif (($pos = strpos($input, '/', 1)) !== false)

            {

                $output .= substr($input, 0, $pos);

                $input = substr_replace($input, '', 0, $pos);

            }

            else

            {

                $output .= $input;