Symfony

Eases the creation of beautiful and testable command line interfaces

Defines an object-oriented layer for the HTTP specification

Provides tools that allow your application components to communicate with each other by dispatching events and listening to them

Finds files and directories via an intuitive fluent interface

Provides a structured process for converting a Request into a Response

Symfony polyfill for the Mbstring extension

Maps an HTTP request to a set of configuration variables

Executes commands in sub-processes

Converts CSS selectors to XPath expressions

Provides mechanisms for walking through any arbitrary PHP variable

Provides tools to ease debugging PHP code

Provides tools to internationalize your application

Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions

Provides basic utilities for the filesystem

Helps you find, load, combine, autofill and validate configuration values of any kind

Allows you to standardize and centralize the way objects are constructed in your application

Provides extended PSR-6, PSR-16 (and tags) implementations

Symfony polyfill for ctype functions

Eases DOM navigation for HTML and XML documents

A set of abstractions extracted out of the Symfony components