Laravel Routing: quick revision, 12 bites

Routing: The Heart of Laravel

URLs map to actions.

**Routing** in Laravel defines how your application responds to HTTP requests. It maps a **URI** to a specific **action** (a closure or controller method). All routes are defined in files under the `routes` directory, primarily `routes/web.php` for web requests and `routes/api.php` for API endpoints.

Takeaway. Every request to your Laravel app is handled by a route.

Basic Route Definition

Simple closures, big power.

The `Route` facade provides methods for all HTTP verbs: `get`, `post`, `put`, `patch`, `delete`, `options`. The first argument is the URI, the second is the action.

Takeaway. Use Route::verb(uri, action) to define a route.

Available Router Methods

Match any HTTP verb.

Takeaway. Laravel supports all common HTTP verbs out of the box.

Route Parameters: Dynamic URLs

Capture values from the URL.

**Route parameters** allow you to capture segments of the URI. They are always enclosed in curly braces `{}` and passed to your closure or controller.

Takeaway. Use curly braces to capture dynamic segments.

Regular Expression Constraints

Validate parameters on the fly.

You can constrain route parameters with **regular expressions** using the `where` method. This ensures only matching values reach your action.

Takeaway. Constrain parameters to avoid invalid input.

Named Routes: Referencing by Name

Give your routes a nickname.

**Named routes** allow you to generate URLs or redirects without hardcoding URIs. Assign a name using the `name` method.

Takeaway. Named routes decouple your code from URIs.

Route Groups: Organize and Share

Group routes with common traits.

**Route groups** let you share attributes like middleware, prefixes, or namespaces across many routes without repeating them.

Takeaway. Groups reduce repetition and improve readability.

Middleware: Filtering Requests

Gatekeeper for your routes.

**Middleware** provides a convenient mechanism for filtering HTTP requests entering your application. Assign middleware to routes using the `middleware` method.

Takeaway. Middleware adds layers of control before the request hits your action.

Controller Routes: Cleaner Actions

Move logic out of closures.

Instead of closures, you can point routes to **controller methods**. This keeps your route files clean and organizes logic.

Takeaway. Controllers keep routes expressive and maintainable.

Route Model Binding: Automatic Injection

Let Laravel fetch models.

**Route model binding** automatically injects model instances into your routes based on the parameter name. For example, `{user}` will inject a `User` model with that ID.

Takeaway. Binding reduces boilerplate and ensures valid models.

Route Caching: Speed Up Production

Cache routes for performance.

Laravel can cache your routes to drastically reduce the time it takes to register them. Use the Artisan command `php artisan route:cache`.

Takeaway. Always cache routes in production for speed.

Fallback Routes: Catch-All

Handle unmatched URLs gracefully.

Use `Route::fallback` to define a route that executes when no other route matches. This is perfect for custom 404 pages.

Takeaway. Fallback routes provide a safety net for unmatched requests.