Upside down footnotes

Question

I want footnotes to appear upside down. Except for that, they should act as regular footnote, i.e. also share the numbering with non-upside down footnotes. I already found a way of making the footnote appear upside down taken from this question, but what is missing is the numbering which I can't quite figure out. Here is a MWE for what I have so far:

\documentclass{book}
\usepackage{graphicx}
\usepackage{enumitem}\newsavebox\fnbox
\newcommand\revfootnote[1]{\renewcommand{\thefootnote}{}%
  \footnotetext{\savebox\fnbox{\parbox{%
  \dimexpr\textwidth\relax}{#1\strut}}\kern-18pt%
  \rotatebox{180}{\usebox{\fnbox}}}}
\begin{document}
This sentence has a footnote.\revfootnote{This is the footnote.}
\end{document}

Answer 1

you can do so with a counter, and slightly modifying your code like this :

\documentclass{book}
\usepackage{graphicx}
\usepackage{titlefoot}

\newcounter{revcounter}
\setcounter{revcounter}{1}
\usepackage{enumitem}\newsavebox\fnbox
\newcommand\revfootnote[1]{
    \renewcommand{\thefootnote}{\therevcounter}
  \footnote{\savebox\fnbox{\parbox{%
  \dimexpr\textwidth\relax}{#1\strut}}\kern-18pt%
  \rotatebox{180}{\usebox{\fnbox}}}
  \addtocounter{revcounter}{1}}
\begin{document}
This sentence has a footnote.\revfootnote{This is the footnote.}
\end{document}

However, this probably don't work with hyperref package, and it creates a little space between the text and the number, but I don't know why..