# Overview

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[The most awesome validation engine ever created for PHP.](http://bit.ly/1a1oeQv)

- Complex rules made simple: `v::numeric()->positive()->between(1, 255)->validate($input)`.
- [Granularity control](feature-guide.md#validation-methods) for advanced reporting.
- More than 100 (fully tested) validators.
- [A concrete API](concrete-api.md) for non fluent usage.
- Works on PHP 5.4+ or HHVM 3.3+
