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Wordpress: extend doc on PHP extensions 

The lack of emailing is a good example of an additional extension that is not included in the image. Also referencing [wordpress/issues/30](https://github.com/docker-library/wordpress/issues/30) because it contains good suggestions on the topic.
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Adrien Luxey 2020-03-31 08:10:50 +02:00 committed by Tianon Gravi
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@ -60,7 +60,7 @@ Run `docker stack deploy -c stack.yml %%REPO%%` (or `docker-compose -f stack.yml
## Adding additional libraries / extensions
This image does not provide any additional PHP extensions or other libraries, even if they are required by popular plugins. There are an infinite number of possible plugins, and they potentially require any extension PHP supports. Including every PHP extension that exists would dramatically increase the image size.
This image does not provide any additional PHP extensions or other libraries, even if they are required by popular plugins (e.g. [it cannot send e-mails](https://github.com/docker-library/wordpress/issues/30)). There are an infinite number of possible plugins, and they potentially require any extension PHP supports. Including every PHP extension that exists would dramatically increase the image size.
If you need additional PHP extensions, you'll need to create your own image `FROM` this one. The [documentation of the `php` image](https://github.com/docker-library/docs/blob/master/php/README.md#how-to-install-more-php-extensions) explains how to compile additional extensions. Additionally, the [`wordpress` Dockerfile](https://github.com/docker-library/wordpress/blob/618490d4bdff6c5774b84b717979bfe3d6ba8ad1/apache/Dockerfile#L5-L9) has an example of doing this.