To configure XCache, edit /etc/php-5.6.sample/xcache.ini.
You can enable this module by creating a symbolic
link from /etc/php-5.6.sample/xcache.ini to
/etc/php-5.6/xcache.ini.

ln -fs /etc/php-5.6.sample/xcache.ini \
        /etc/php-5.6/xcache.ini
