A fast and flexible PHP router with Sinatra-inspired regular expression routing for building web applications.
Klein.php is a fast and flexible routing library for PHP that allows developers to define HTTP routes using expressive, Sinatra-inspired syntax. It solves the problem of handling URL routing in web applications with minimal overhead, providing tools for request/response management, validation, and view rendering.
PHP developers building web applications who need a lightweight, performant routing solution without the complexity of a full-stack framework.
Developers choose Klein.php for its speed (2500+ requests/second), flexible regular expression routing, and comprehensive feature set including validation, service containers, and view helpers—all with minimal dependencies.
A fast & flexible router
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Benchmarks show 2500+ requests per second with minimal overhead, making it ideal for fast web applications as highlighted in the README.
Supports Sinatra-inspired regular expression patterns, named parameters, optional segments, and RESTful routes for complex routing needs.
Includes built-in, chainable validators for input sanitization and allows adding custom validators via addValidator().
Provides a service container for sharing dependencies and lazy-loading resources, enhancing modularity and resource management.
Missing common web components like authentication, ORM, or session management, requiring manual implementation and extra dependencies.
Requires URL rewriting setup and explicit routing definitions, which can be tedious and error-prone for large or complex applications.
The README focuses on API methods without comprehensive tutorials, and it has fewer community extensions compared to full frameworks like Laravel.