A simple validation library.

A JSON Schema validation library.

A standards compliant HTML filter.

A validation library with a rich set of assertions. Supports assertion chaining and lazy assertions.

A library for handling file uploads and validation.

Another validation library.

A library for mapping to strongly typed value objects.

A library for validating inputs according to standards from ISO, International Finance, Public Administrations, GS1, Book Industry, Phone numbers & Zipcodes for many countries.

A simple PHP filtering library.

An HTML sanitizer library.

Provides tools to validate and sanitize objects and arrays.

A schema validation library that supports YAML, JSON and XML.

Another simplified validation library.

Another validation library.