Variable::export uses var_export which does not use short array syntax

Problem/Motivation

PHP var_export does not output in short array syntax and is used to generated PHP files. The related PHP RFC is PHP RFC: Change var_export() array syntax to use shorthand arrays.

This is a follow up from 📌 Variable::export should export use short-hand array syntax Needs work .

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet