Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions

 This component provides a idn_to_ascii and idn_to_utf8 functions to users who
 run PHP versions without 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.