PHP extension for encodings (UTF-8) missing

[minthemiddle]

mbstring handles encodings in PHP. If any package uses UTF-8, it needs mbstring.

It is not yet in the build image. Many projects based on Symfony or Laravel will not build.

Adding it could be as simple as sudo apt-get install php7.2-mbstring. For some strange reasons, PHP core does not require it, despite 80% of modern PHP packages depend on it.

Could create a PR as well.

[brycekahle]

This is live in production now. Thanks for putting PHP through its paces!

[minthemiddle]

Works flawlessly! Great work @brycekahle