Kit Library / Computer Science / PHP Frameworks
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💡 Key Idea
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.
↳ Every request to your Laravel app is handled by a 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.
↳ Use Route::verb(uri, action) to define a route.
⭐ Important Fact
Match any HTTP verb.
↳ Laravel supports all common HTTP verbs out of the box.
⚙️ Process
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.
↳ Use curly braces to capture dynamic segments.
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.
↳ Constrain parameters to avoid invalid input.
💡 Key Idea
Give your routes a nickname.
Named routes allow you to generate URLs or redirects without hardcoding URIs. Assign a name using the `name` method.
↳ Named routes decouple your code from URIs.
🛠️ Application
Group routes with common traits.
Route groups let you share attributes like middleware, prefixes, or namespaces across many routes without repeating them.
↳ Groups reduce repetition and improve readability.
⭐ Important Fact
Gatekeeper for your routes.
Middleware provides a convenient mechanism for filtering HTTP requests entering your application. Assign middleware to routes using the `middleware` method.
↳ Middleware adds layers of control before the request hits your action.
Move logic out of closures.
Instead of closures, you can point routes to controller methods. This keeps your route files clean and organizes logic.
↳ Controllers keep routes expressive and maintainable.
⚠️ Common Mistake
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.
↳ Binding reduces boilerplate and ensures valid models.
🎯 Exam Tip
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`.
↳ Always cache routes in production for speed.
❓ Did You Know
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.
↳ Fallback routes provide a safety net for unmatched requests.
Laravel routing maps HTTP requests to application actions, defining how your app responds to URLs. It supports basic closures, controller actions, route parameters, middleware, groups, and advanced features like model bi…
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All 17 questions, laddered from warm-up to topper-level, each with its answer and the reasoning behind it.
Q1. Which file is used to define routes in a Laravel application?
BeginnerC · routes/web.php
In Laravel, web routes are defined in routes/web.php. This file is loaded by the RouteServiceProvider.
Q2. Which HTTP verb is used to retrieve a resource in Laravel routing?
BeginnerA · GET
The GET method is used to request data from a specified resource. In Laravel, Route::get() defines a route that responds to GET requests.
Q3. What is the correct way to define a route parameter in Laravel?
BeginnerA · Route::get('/user/{id}', ...)
Laravel uses curly braces to define route parameters, e.g., {id}.
Q4. How can you retrieve the value of a route parameter in a controller?
BeginnerB · By type-hinting the parameter in the controller method
Route parameters are injected into controller methods as arguments. You can also access them via the Request object.
Q5. Which method is used to define a route that responds to a specific HTTP verb and URI?
BeginnerD · Route::get()
Route::get() defines a route that responds to GET requests. Similarly, other methods exist for other verbs.
Q6. The Route::any() method allows a route to respond to all HTTP verbs.
BeginnerA · True
Route::any() registers a route that responds to any HTTP verb (GET, POST, PUT, DELETE, etc.).
Q7. Which method is used to define a route that responds to multiple HTTP verbs?
IntermediateC · Route::match()
Route::match() allows you to specify an array of HTTP verbs that the route should respond to. Route::any() responds to all verbs.
Q8. Which method is used to name a route in Laravel?
IntermediateC · ->name('profile')
The name() method is used to assign a name to a route, allowing you to generate URLs or redirects easily.
Q9. Which middleware is applied to routes defined in routes/web.php by default?
IntermediateD · web
Routes in routes/web.php are automatically assigned the 'web' middleware group, which includes session state, CSRF protection, etc.
Q10. What is the purpose of the Route::resource() method?
IntermediateD · To create multiple routes for a resource controller
Route::resource() generates all the necessary routes for a typical 'CRUD' resource controller.
Q11. Which method is used to group routes under a common URL prefix?
IntermediateD · Route::prefix('admin')->group(...)
The prefix() method is used to add a prefix to all routes within a group. Alternatively, you can use the 'prefix' key in the group array.
Q12. What is the correct way to apply a middleware to a specific route?
IntermediateC · Route::get('/profile', ...)->middleware('auth')
The middleware() method is used to assign middleware to a route.
Q13. Which method is used to generate a URL for a named route?
IntermediateC · route('profile')
The global route() helper function generates a URL for a given named route.
Q14. Routes defined in routes/api.php are stateless and do not have session state.
IntermediateA · True
API routes are stateless and do not include session state or CSRF protection, unlike web routes.
Q15. Which method is used to define a fallback route in Laravel?
AdvancedD · Route::fallback()
Route::fallback() defines a route that will be executed when no other route matches the incoming request.
Q16. What is the purpose of the Route::apiResource() method?
AdvancedC · To create API resource routes without 'create' and 'edit' routes
Route::apiResource() excludes the 'create' and 'edit' routes, which are not needed for APIs.
Q17. What is route model binding in Laravel?
AdvancedB · Automatically injecting model instances into routes based on route parameters
Route model binding automatically resolves Eloquent models from route parameters. For example, {user} will inject the User model with matching ID.
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