Laravel URL generation

Laravel provides several helpers to assist you in generating URLs for your application. Of course, these are mainly helpful when building links in your templates and API responses, or when generating redirect responses to another part of your application.
URLをつくるねー

The Basics
Generating Basic URLs
The url helper may be used to generate arbitrary URLs for your application. The generated URL will automatically use the scheme (HTTP or HTTPS) and host from the current request:

$post = App\Post::find(1);
echo url("/posts/{$post->id}");
// http://example.com/posts/1

Accessing The Current URL
If no path is provided to the url helper, a Illuminate\Routing\UrlGenerator instance is returned, allowing you to access information about the current URL:

// Get the current URL without the query string...
echo url()->current();
// Get the current URL including the query string...
echo url()->full();
// Get the full URL for the previous request...
echo url()->previous();

URLs For Named Routes
The route helper may be used to generate URLs to named routes. Named routes allow you to generate URLs without being coupled to the actual URL defined on the route. Therefore, if the route’s URL changes, no changes need to be made to your route function calls. For example, imagine your application contains a route defined like the following:

Route::get('/post/{post}', function () {
    //
})->name('post.show');

echo route('post.show', ['post' => 1]);

// http://example.com/post/1

Eloquent modelsの意味がわからん。
echo route(‘post.show’, [‘post’ => $post]);

Laravel allows you to easily create “signed” URLs to named routes. These URLs have a “signature” hash appended to the query string which allows Laravel to verify that the URL has not been modified since it was created. Signed URLs are especially useful for routes that are publicly accessible yet need a layer of protection against URL manipulation.

For example, you might use signed URLs to implement a public “unsubscribe” link that is emailed to your customers. To create a signed URL to a named route, use the signedRoute method of the URL facade:
あーなるほど。というか、全てsignedRouteになるのか。

use Illuminate\Support\Facades\URL;
return URL::signedRoute('unsubscribe', ['user' => 1]);

use Illuminate\Support\Facades\URL;
return URL::temporarySignedRoute(
    'unsubscribe', now()->addMinutes(30), ['user' => 1]
);

hasValidSignatureって、ログイン状態と違うのか？普通のphpなら、ログイン状態かsessionをみて判断するけど。

use Illuminate\Http\Request;

Route::get('/unsubscribe/{user}', function (Request $request) {
    if (! $request->hasValidSignature()) {
        abort(401);
    }

    // ...
})->name('unsubscribe');

/**
 * The application's route middleware.
 *
 * These middleware may be assigned to groups or used individually.
 *
 * @var array
 */
protected $routeMiddleware = [
    'signed' => \Illuminate\Routing\Middleware\ValidateSignature::class,
];

URLs For Controller Actions
The action function generates a URL for the given controller action. You do not need to pass the full namespace of the controller. Instead, pass the controller class name relative to the App\Http\Controllers namespace:
個別に見ていくしかないのか

$url = action('HomeController@index');

use App\Http\Controllers\HomeController;
$url = action([HomeController::class, 'index']);

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\URL;

class SetDefaultLocaleForUrls
{
    public function handle($request, Closure $next)
    {
        URL::defaults(['locale' => $request->user()->locale]);
        return $next($request);
    }
}

あ、次がsessionだから、いよいよ本丸登場だ。