[wp-meta] [Making WordPress.org] #1297: Disappearing topic titles on Rosetta forums

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Mon Nov 23 14:57:32 UTC 2015

#1297: Disappearing topic titles on Rosetta forums
  Reporter:  SergeyBiryukov  |      Owner:
      Type:  defect          |     Status:  new
  Priority:  normal          |  Component:  International Forums
Resolution:                  |   Keywords:

Comment (by SergeyBiryukov):

 @netweb pointed out that `_fix_badly_utf8_trimmed_string.php` is the most
 likely cause:
 function fix_badly_utf8_trimmed_string( $string ) {
         return iconv( 'utf-8', 'utf-8//ignore', $string );

 add_filter( 'topic_title', 'fix_badly_utf8_trimmed_string', 9 );
 add_filter( 'term_name', 'fix_badly_utf8_trimmed_string', 9 );

 via https://php.net/manual/en/function.iconv.php#108643:
 > The `//ignore` option doesn't work with recent versions of the iconv
 library.  So if you're having trouble with that option, you aren't alone.
 > That means you can't currently use this function to filter invalid
 characters.  Instead it silently fails and '''returns an empty string'''
 (or you'll get a notice but only if you have E_NOTICE enabled).

 I've tested it with a broken string (`Как вернуться на 4.2, как запретить
 автоматическое обно�`), and it does return an empty string on my install
 (PHP 5.4.45, iconv 1.14).

 `mb_convert_encoding()` handles this correctly:
 function fix_badly_utf8_trimmed_string( $string ) {
         ini_set( 'mbstring.substitute_character', 'none' );
         return mb_convert_encoding( $string, 'UTF-8', 'UTF-8' );

Ticket URL: <https://meta.trac.wordpress.org/ticket/1297#comment:11>
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