phpspec is a mature Behavior-Driven Development (BDD) testing framework for PHP, functionally a Command-Line Interface (CLI) application and developer toolset rather than an application server. In production (i.e., when run in a developer workflow via `bin/phpspec`), it locates PHP spec files, executes each example method through a runner pipeline composed of 'maintainers' (subject creation, matcher injection, let/letgo lifecycle, error handling), evaluates assertions against a flexible priority-based matcher system, and reports results through pluggable formatters (progress, dot, JUnit, TAP, HTML, JSON, TeamCity). It also performs interactive code generation: when a spec fails because a class or method does not exist, listeners prompt the developer and generate the missing class, method, interface, named constructor, or return constant using token-based code writers and templates, then automatically re-runs the suite. The architecture is event-driven (Symfony EventDispatcher), wired through a custom service container (`IndexedServiceContainer`), with an extension API (`PhpSpec\Extension`) for registering custom matchers, formatters, and listeners. The framework is self-hosted: it tests itself using its own spec system and Behat feature tests, with extensive spec coverage for nearly every class.