The Symfony PHP framework
The Debug component provides tools to ease debugging PHP code.
REST and GraphQL framework to build modern API-driven projects (server-side and client-side)
The HttpFoundation component defines an object-oriented layer for the HTTP specification.
The Console component eases the creation of beautiful and testable command line interfaces.
The VarDumper component provides mechanisms for walking through any arbitrary PHP variable. It provides a better dump() function that you can use instead of var_dump().
Give thanks (in the form of a GitHub ★) to your fellow PHP package maintainers (not limited to Symfony components)!
The Finder component finds files and directories via an intuitive fluent interface.
The CssSelector component converts CSS selectors to XPath expressions.