Framework agnostic validation library for PHP
PHP Standalone Validation Library
Cryptocurrency address validation library
Laravel package to allow users addresses validation
The most awesome validation engine ever created for PHP
A simple, extensible validation library for PHP with support for filtering and validating any input array along with generating client side validation code.
A validation library for the Slim Framework. It internally uses Respect/Validation.
[READ ONLY] Subtree split of the Illuminate Validation component (see laravel/framework)