While installing a testing version of MediaWiki on a VM instance, the welcome page warned that an environment check had failed:
Warning: The intl PECL extension is not available to handle Unicode normalization, falling back to slow pure-PHP implementation. If you run a high-traffic site, you should read a little on Unicode normalization.
I had been careful (as always) to use the following line in my nginx.conf:
In this case though, php5-intl needed to be installed:
# apt-get install php5-intl
The resulting download was 22.5MB, which seemed a little large. Regardless, after downloading, the intl.ini mod was loaded and the PHP5 FastCGI Process Manager reloaded:
==> Setting up libicu48:amd64 (22.214.171.124-12+deb7u1) ... ==> Setting up php5-intl (5.4.4-14+deb7u10) ... ==> Creating config file /etc/php5/mods-available/intl.ini ==> with new version ==> Processing triggers for php5-fpm ... ==> [ ok ] Restarting PHP5 FastCGI Process Manager: php5-fpm.
Now the MediaWiki install environment check reported:
Using the intl PECL extension for Unicode normalization.