Symfony polyfill for intl's MessageFormatter class and related functions

 This component provides a fallback implementation for the MessageFormatter
 class provided by the Intl extension.
 .
 The Symfony Polyfill project backports features found in the latest PHP
 versions and provides compatibility layers for some extensions and functions.
 It is intended to be used when portability across PHP versions and extensions
 is desired.
 .
 Symfony is a PHP framework, a set of tools and a development methodology.