undefined function mb_substr() in DokuPath.php

[tschuettenberg]

Hi, there is an issue in DokuPath.php resulting in a blank page and unusable dokuwiki.

Did a fresh install of 2020-07-29 "Hogfather" with PHP 7.4.3 and following https://combostrap.com/docs/how-to-configure-and-get-started-with-a-combostrap-website-m3i8vga8

From my log:

[Sat Jan 29 15:27:04.904342 2022] [php7:error] [pid 68063] [client 127.0.0.1:58960] PHP Fatal error:  Uncaught Error: Call to undefined function mb_substr() in /var/www/html/dokuwiki/lib/plugins/combo/ComboStrap/DokuPath.php:167

Stack trace:
  /var/www/html/dokuwiki/lib/plugins/combo/ComboStrap/DokuPath.php(226): ComboStrap\\DokuPath->__construct()
  /var/www/html/dokuwiki/lib/plugins/combo/ComboStrap/Page.php(247): ComboStrap\\DokuPath::createPagePathFromPath()
  /var/www/html/dokuwiki/lib/plugins/combo/ComboStrap/Page.php(271): ComboStrap\\Page->__construct()
  /var/www/html/dokuwiki/lib/plugins/combo/action/metalang.php(41): ComboStrap\\Page::createPageFromId()
  /var/www/html/dokuwiki/inc/Extension/EventHandler.php(81): action_plugin_combo_metalang->load_lang()
  /var/www/html/dokuwiki/inc/Extension/Event.php(72): dokuwiki\\Extension\\EventHandler->process_event()
  /var/www/html/dokuwiki/inc/Extension/Event.php(128): dokuwiki\\Extension\\Event->advise_before()
  /var/www/html/dokuwiki/inc/Extension/Event.php(195): dokuwiki\\Extension\\Event->trigger()
  /var/www/html/dokuwiki/inc/init.php(224): dokuwiki\\E in /var/www/html/dokuwiki/lib/plugins/combo/ComboStrap/DokuPath.php on line 167, referer: http://localhost/doku.php?id=start&do=admin&page=extension

[gerardnico]

This is because your installation does not have the mbstring extension loaded. This is mandatory for any international application (dokuwiki included)

In your php.ini, you should have at minimum this extension.

[PHP]
; for image
extension=gd2
extension=fileinfo
extension=mbstring
extension=pdo_sqlite
extension=openssl
; for locale
extension=intl

[tschuettenberg]

Oh yes, that's the issue. Thanks for pointing me at it!

BTW, your ComboStrap is awesome, the Docs in particular, all the best!

[gerardnico]

Thanks. We can always improved.

I have just updated the installation server requirment to show up the extension page prominently.