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What is middleware in the context of a web application, and how does it let you run logic before or after a request is handled by its intended route? How does a middleware pipeline execute multiple middleware in sequence, and how does the concept of calling the next middleware let each one decide whether to continue processing the request? How do route parameters and route constraints let you capture dynamic segments of a URL while also restricting what values are actually considered a valid match? How can route groups let you apply shared configuration, such as a common URL prefix or a set of middleware, to several related routes at once? How does middleware priority and ordering affect application behavior when multiple middleware, such as authentication and rate limiting, are applied to the same route together? How can a custom routing system be designed to support efficient route matching performance even as an application grows to have hundreds or thousands of defined routes?
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What is routing in a PHP web application, and how does a router determine which piece of code should handle a specific incoming request?

Beginner

Answer

Routing is the process of mapping an incoming request's URL and HTTP method to a specific piece of code responsible for handling it, typically a controller method or a closure, and a router examines the request and matches it against a list of previously defined route patterns, some of which may contain dynamic segments representing things like a specific resource identifier, executing the corresponding handler once a match is found.
$routes = [
    'GET /products' => 'ProductController@index',
    'GET /products/{id}' => 'ProductController@show',
];
Real-world example A simple custom router matches an incoming GET request for a specific product URL against its list of defined routes, correctly identifying that it should invoke the show method of ProductController along with the captured product identifier.

Common follow-ups: What happens if an incoming request does not match any defined route?;How does a router typically handle extracting dynamic segments like a resource identifier from the URL?

MVC Architecture in PHP;RESTful API Development with PHP
All 7 Routing & Middleware questions