phpspec is a mature Behavior-Driven Development (BDD) testing framework for PHP, delivered both as a CLI tool (`bin/phpspec`) and an embeddable library. In production it runs executable specifications (spec files extending `ObjectBehavior`) via two Symfony Console commands: `describe` generates a spec skeleton from a class name, and `run` discovers spec files through PSR-0/PSR-4 locators, executes them through a layered runner stack (suite -> specification -> example), evaluates assertions through a pluggable matcher library (identity, comparison, throw, trigger, iterable, array, string, etc.), and renders results through swappable formatters (progress, pretty, dot, JUnit, TAP, TeamCity, HTML, JSON). A distinctive feature is listener-driven code generation: when a spec references a missing class, method, collaborator, or named constructor, listeners prompt the developer and generate real PHP source via token-based code writers, then transparently re-run the suite using platform-specific process re-runners (pcntl, proc_open, Windows passthru). The framework couples to Prophecy for mocking and rewrites type hints in spec files at load time using a tokenizer state machine so Prophecy doubles work with modern PHP union/intersection types.