php-icu-testing

I put this repository together to illustrate issues I'm facing with various versions of ICU, any of which PHP might be built with, depending on the default distribution packages of the underlying system.

First, clone this repository and run build_images.sh to build a handful of Docker images to use for testing:

git clone https://github.com/ramsey/php-icu-testing.git
cd php-icu-testing/
./build_images.sh

Then, run the following Docker commands to execute the example within the containers.

docker run --rm -it -v $PWD:/src -w /src php-icu:7.4-70 php example.php
docker run --rm -it -v $PWD:/src -w /src php-icu:7.4-69 php example.php
docker run --rm -it -v $PWD:/src -w /src php-icu:7.4-68 php example.php
docker run --rm -it -v $PWD:/src -w /src php-icu:7.4-67 php example.php
docker run --rm -it -v $PWD:/src -w /src php-icu:7.4-66 php example.php

You'll note that the script begins failing in image php-icu:7.4-68. The version of ICU used in this image is 68.1. As this illustrates, either ICU 68.1 doesn't support the message format syntax in the example, or PHP's integration with ICU 68.1 doesn't support it. Either way, it's incredibly difficult to communicate this dependency from composer.json, since ext-intl is not versioned, much less can you specify the version of ICU to use.