This is a description for including PHP-DI into Moodle core

Dependencies

Please note that this library depends upon:

Laravel\SerializableClosure to support run-time compilation of closures for caching
PHP-DI\Invoker to standardise invocation of methods and factories with mixed argument types

Installation

installdir=`mktemp -d`
cd "$installdir"
composer require php-di/php-di
cd -
rm -rf lib/php-di/php-di lib/php-di/invoker lib/laravel/serializable-closure
cp -rf "$installdir"/vendor/php-di/php-di lib/php-di/php-di
echo "See instructions in lib/php-di/readme_moodle.md" > lib/php-di/php-di/readme_moodle.txt
git add  lib/php-di/php-di

cp -rf "$installdir"/vendor/php-di/invoker lib/php-di/invoker
echo "See instructions in lib/php-di/readme_moodle.md" > lib/php-di/invoker/readme_moodle.txt
git add  lib/php-di/invoker

cp -rf "$installdir"/vendor/laravel/serializable-closure lib/laravel/serializable-closure
echo "See instructions in lib/php-di/readme_moodle.md" > lib/laravel/serializable-closure/readme_moodle.txt
git add  lib/laravel/serializable-closure

Now update the thirdpartylibs.xml as appropriate.