PsySH

PsySH is a runtime developer console, interactive debugger and REPL for PHP. It provides an interactive environment where developers can evaluate PHP code, inspect code structures, explore classes and functions, and debug applications. The tool includes features such as a powerful interactive REPL with tab completion, inline documentation access, source code viewing, namespace support, and an interactive debugger that can be dropped into code. It integrates with frameworks and command-line tools including Laravel Tinker, Drush, and WP-CLI.

PsySH is developed by bobthecow and released under the MIT license. The tool can be installed directly, via the Composer package manager, or run in a browser using PHP-WASM. It is open source software available for PHP developers who need an interactive shell for experimentation and debugging.