PHP

laravel custom 404 blade

// Create a file in resources/views/errors/404.blade.php and add this code.
@extends('errors::minimal')

@section('title', __('Not Found'))
@section('code', '404')

@if($exception)
    @section('message', $exception->getMessage())
@else
    @section('message', __('Not Found'))
@endif
  
 abort(404, 'Whatever you were looking for, look somewhere else');

laravel 404

//Some exceptions describe HTTP error codes from the server. For example, this may be a "page not found" error (404),
//In order to generate such a response from anywhere in your application, you may use the abort helper:

return abort(404);
// OR
return abort(404, "page not found");

404 page in laravel

//step 1 ) create the errors/404.blade.php in view.

// step 2 ) go to Handler.php and replace the render function to belwo function.
  public function render($request, Throwable $exception)
    {
        if ($exception instanceof AccessDeniedHttpException) {
            return response(view('errors.404'), 404);
        }
        return parent::render($request, $exception);
    }

custom 404 page in laravel

A very simple one
  
  php artisan vendor:publish --tag=laravel-errors