Description:
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 $_SERVER['PATH_INFO'] doesn't return single quote in filename.
Although single quote in filenames were used frequently in French while using mediawiki server. But in recent versions of mediawiki (svn) we can upload images or pdf files having quotes in their name, like "Rapport d'activité.pdf" but we can't retrieve any more because the $_SERVER['PATH_INFO'] is returning a question mark instead of a quote "/6/6e/Rapport_d?activité.pdf". It has been working for years and now it says "Access denied, you must log in".

It doesn't affect all wiki servers but only servers where access to files is granted via the img_auth.php (which means that only logged users can access to uploaded images).

The orginal code of img_auth.php was:
  $path = $_SERVER['PATH_INFO'];
  $filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
  wfDebugLog( 'img_auth', "\$path is {$path}" );

and the log output contains a question mark instead of the quote.

I decided to patch by replacing the question mark with a single quote:
 
 $path = preg_replace('/\?/','\'', $_SERVER['PATH_INFO']);

and it works but it is not very clean.

What is wrong with having single quote in the PATH_INFO as long as filenames can have single quote?

Many thanks for any information.