List of lightweight PHP libraries.

• Frameworks
• Dependency Injection
• Events
• Routing
• Templating
• HTTP
• Middleware
• Log
• Validation and Filtering
• Graphics

• Lime - Micro framework for quickly creating web applications with minimal effort

• Medoo - The Lightest PHP database framework to accelerate development
• bephp/activerecord - Micro activerecord library in PHP
• MongoLite - Schemaless database on top of SqLite

• Pimple - A small PHP 5.3 dependency injection container
• Auryn - IoC dependency injector
• Orno\Di - A fast and powerful dependency injection container
• Containers - An implementation of the registry pattern
• Dice - A minimalist Dependency injection container (DIC) for PHP

• Événement - Very simple event dispatching library
• Sabre Event - A library for lightweight event-based programming

• FastRoute - Fast request router for PHP
• Walkway - Elegant, modular router for PHP
• Aura.Router - A web router implementation for PHP
• bephp/router - A barebones router for PHP

• php-view - More secure and easy to use templating system for php5.4+
• date-formatter - Render dates and date ranges in a human-readable format
• parsedown - Better Markdown Parser in PHP

• Httpful - A chainable, REST friendly, PHP HTTP client
• Negotiation - Content negotiation tools for PHP
• HTTPlug - HTTP client abstraction for PHP
• Unirest - Simplified, lightweight HTTP client library
• Httpstatus - A minimal package for working with HTTP statuses
• HttpMessage - Just another PHP implementation of PSR-7
• p3k-http - A simple wrapper API around the PHP curl functions

• Tari-PHP - A middleware proposal for PHP
• Relay - A PSR-7 middleware dispatcher
• Sirius - Lightweight middleware implementation

• APIx Log - A thin (and fast) PSR-3 logger

• Valitron - A simple, elegant, stand-alone validation library
• Filterus - A simple filtering library for PHP
• Plan - Fast and simple validation for PHP

• PieChart - A simple class for drawing pie charts
• Zebra_Image - A compact and lightweight library for image manipulation