It's a phpenv/phpenv plugin to enable/disable configs.
Simply clone the repository into the plugins directory:
mkdir -p "$(phpenv root)/plugins"
git clone git://github.com/sergeyklay/phpenv-config-add.git "$(phpenv root)/plugins/phpenv-config-add"
phpenv config-add /path/to/config.ini
phpenv config-rm config.ini || true
The phpenv-config-add
is released under the MIT License.