php-symfony-polyfill-util 1.9.0-1 (amd64 binary) in ubuntu cosmic

 This component provides binary-safe string functions, using the mbstring
 extension when available.
 .
 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.