Php error "Constant UNICODE HANGUL FIRST already defined"

Problem description:

• php errors encountered after installing a second mediawiki virtual server using webapp-config
• mediawiki instances were installed using the following commands:

webapp-config -I -h example.com/wiki_1 mediawiki 1.18.2
webapp-config -I -h example.com/wiki_2 mediawiki 1.18.2

• only one mediawiki instance would work at a time, when failing, the wiki main page could not be accessed. Only a page full of errors like below would be displayed.

error messages

browser errors:

Notice: Constant UNICODE_HANGUL_FIRST already defined in /var/www/example.com/wiki_2/includes/normal/UtfNormalDefines.php on line 3


Notice: Constant UNICODE_HANGUL_LAST already defined in /var/www/example.com/wiki_2//includes/normal/UtfNormalDefines.php on line 4


Notice: Constant UNICODE_HANGUL_LBASE already defined in /var/www/example.com/wiki_2/includes/normal/UtfNormalDefines.php on line 6

solution

uninstall mediawikis with webapp-config

webapp-config --clean -h example.com/wiki_1 mediawiki 1.18.2
webapp-config --clean -h example.com/wiki_2 mediawiki 1.18.2

reinstall mediawiki instances with webapp-config using soft links

webapp-config -I --soft -h example.com/wiki_1 mediawiki 1.18.2
webapp-config -I --soft -h example.com/wiki_2 mediawiki 1.18.2

re-setup mediawikis via browser to http://example.com/mw-config/