This component provides features added to PHP 8.0 core:

* Stringable interface * fdiv * ValueError class * UnhandledMatchError class * FILTER_VALIDATE_BOOL constant * get_debug_type * preg_last_error_msg * str_contains * str_starts_with * str_ends_with * get_resource_id * Attribute class

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.