How to handle SEO friendly urls

Framework has really nothing to say here. This works everywhere the same way. At first, all your models need to have slugs that will be used inside URLs - there is an awesome package that provides this outside the box - https://github.com/spatie/laravel-sluggable. Secondly, you need to create URLs that take all these slugs as parameters.

For example:

action('PageController@show', [$category->slug, $subject->slug, $page->slug])

Thank you for your response, but I have slug columns and pass them through as parameters, but how would you then compare these separate tables so the The chain is validated so you would come to the right page at the end of the url?

It would work.

//Route
Route::pattern('categorySlug', '[a-z\-]+');
Route::pattern('subjectSlug', '[a-z\-]+');
Route::pattern('pageSlug', '[a-z\-]+');
Route::get('/{categorySlug}/{subjectSlug}/{pageSlug}', 'PageController@show');
//Controller
public function show($categorySlug,$subjectSlug,$pageSlug)
{
$page = Page::whereSlug($pageSlug)
->whereHas('category', function ($query) use ($categorySlug) {
$query->whereSlug($categorySlug);
})
->whereHas('category.subject', function ($query) use ($subjectSlug) {
$query->whereSlug($subjectSlug);
})->first()
return view('pages.show',compact('page'));

}
//Models
class Page extends Model {
public function category()
{
    return $this->belongsTo('App\Category');
}

}
class Category extends Model {
public function subject()
{
    return $this->belongsTo('App\Subject');
}

}
//View
@extends('layout')
@section('title')
{{ $page->category->title }} | {{ $page->category->subject->title }} | {{ $page->title }}
@endsection
@section('content')
{{ $page->title }}
@endsection

I would think about using "depth". That way you can check the depth and slug for the levels.

Thanks what is depth?

I have approached this by having a helper for more complex routes and then doing a comparison in the controller.

// routes.php
Route::get('designs/{design}-{design_slug}', ['as' => 'design.show', 'uses' => 'DesignController@show']);

// helpers.php
function design_route(App\Design $design)
{
    return route('design.show', [
        'id' => $design->id,
        'design_slug' => $design->slug,
    ]);
}

// DesignController.php
public function show(Request $request, Design $design)
        if ($request->url() != design_route($design)) {
            // test url slug is correct for design
            return redirect(design_route($design), 301);
        }
         
        // proceed...
}

Like, with your structure of your DB. Use a depth field to show the depth/level of the item. Just a thought and one that I've used before.