... I send out a list of most interesting libraries and apps in the "PHP" section to about 1100 subscribers.
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Flexible and reliable way to import, parse, validate and transform your csv files with laravel
Simple file validation & upload class
A fast, extensible & stand-alone PHP input validation class that allows you to validate any data
PHP implementation of JSON schema. Fork of the http://jsonschemaphpv.sourceforge.net/ project
PHP Standalone Validation Library
Upload, validate, storage, manage by API for Laravel 5.x/6.0
File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.
The Config component helps you find, load, combine, autofill and validate configuration values of any kind, whatever their source may be (YAML, XML, INI files, or for instance a database).