A library for validating emails against several RFCs
Symfony Validator Component
The most awesome validation engine ever created for PHP
Simple, elegant, stand-alone validation library with NO dependencies
Symfony Property Info Component
A fast, extensible & stand-alone PHP input validation class that allows you to validate any data.
Validation classes for a wide range of domains, and the ability to chain validators to create complex validation criteria
reCAPTCHA Validator for Laravel 5
PHP library - Validators for standards from ISO, International Finance, Public Administrations, GS1, Book and Music Industries, Phone numbers & Zipcodes for many countries
SPDX licenses list and validation library.
JSONP callback validator.
Validator for Brazilian phone numbers
PHP 5.3 implementation of json schema validation
Custom Laravel Validator for combined unique indexes
PHP receipt validator for Apple iTunes, Google Play and Amazon App Store
Filters to validate and sanitize objects and arrays.
Validate function arguments, extending typehinting capabilities of PHP.
Additional Validator Functions for the Laravel Framework
ZF2 useful tools
A micro-framework provided powerful and simple APIs for faster and easier PHP 5.4+ development.
Password-strength validator bundle for Symfony
Custom Laravel Validator for image dimensions - abandoned since these are now built in to Laravel 5.2 and later
PHP-HTML form manager