Thanks to both ! (I am puzzled at why it worked before, since I did not change my configuration file between updates ... maybe a more robust parser?)

The error condition is solved now, the php file is generated. However, the final string <?php ...?> is not in the file. I tried both:

#+begin_example
       :body-only t
       :html-postamble t
       :html-postamble-format "<?php include 'signature.php'; ?>"
 #+end_example

and

#+begin_example
       :body-only t
       :html-postamble t
       :html-postamble-format '((en "<?php include 'signature.php'; ?>"))
#+end_example

but no luck.
What I want to do is to just append the string '<?php ...?>' at the end of the file, maybe there is a simpler and more idiomatic way of doing it?

Thanks again for your help,

Giuseppe Lipari
CRIStAL,
Université de Lille


Le ven. 7 mai 2021 à 04:08, Timothy <tecosaur@gmail.com> a écrit :

Nick Dokos <ndokos@gmail.com> writes:
>>       :body-only t
>>       :html-postamble: t
>>       :html-postamble-format : "<?php include 'signature.php'; ?>"
>
> This last one seems wrong: the extra space before the colon should probably not be there.
> And I'm not sure whethe the colon after the last two properties should be there at all.

It shouldn't be, it should be:
#+begin_example
       :body-only t
       :html-postamble t
       :html-postamble-format "<?php include 'signature.php'; ?>"
#+end_example

Though the last line may need to be
#+begin_example
       :html-postamble-format '((en "<?php include 'signature.php'; ?>"))
#+end_example
or similar.

--
Timothy