Error Messages - Laravel 5.2 - php

Question

Can someone please tell me how to make my "Page not found" or something messages? For example if someone writes a link in the browser which do not exist in my project, not to show the standard error page ( Woops, something went wrong, View [bla.bla] not found ) but page specified by me?
<?php
Route::get('sendemail', 'EmailController#sendEmail');
Route::get('test', 'AuthController#getTest');
Route::get('napravisiadmin', 'ClassbookController#getIndex');
Route::group(['middleware' => ['web']], function () {
Route::group(['middleware' => ['guest']
], function () {
Route::get('login', 'AuthController#getLogin');
Route::post('login', 'AuthController#postLogin');
});
Route::get('logout', 'AuthController#getLogout');
//Admin
Route::group(['middleware' => ['auth', 'auth.admin']
], function () {
Route::group([
'prefix' => 'admin',
'namespace' => 'Admin'
], function () {
Route::controller('student', 'StudentsController');
Route::controller('profile', 'ProfilesController');
Route::controller('class', 'ClassesController');
Route::controller('subjects', 'SubjectsController');
Route::controller('teacher', 'TeachersController');
Route::controller('marktype', 'MarkTypeController');
Route::controller('rules', 'RuleController');
Route::get('{slug?}', 'PageController#getView');
});
});
//Admin
//Student
Route::group([
'middleware' => ['auth', 'auth.student'],
'prefix' => 'stu',
'namespace' => 'Stu'
], function () {
Route::get('{slug?}', 'StuController#getView');
});
//Student
//Teacher
Route::group([
'middleware' => ['auth', 'auth.teacher'],
'prefix' => 'educator',
'namespace' => 'Educator'
], function () {
Route::get('edit/{id}', 'AccountController#getEdit');
Route::post('edit/{id}', 'AccountController#saveEdit');
Route::get('account', 'AccountController#getView');
Route::get('class-subject', 'AccountController#getClassSubject');
Route::get('add-mark', 'AccountController#getAddMark');
Route::post('mark', 'AccountController#postAddMark');
Route::get('added', 'AccountController#marksList');
Route::get('statistics', 'AccountController#marksInTable');
Route::get('personalemails', 'PersonalEmailController#getView');
Route::post('personalemails', 'PersonalEmailController#personalEmail');
});
//Teacher
});
Route::get('{slug?}', 'PageController#getView');

Answer 1

For the "Page not found" 404 error create a view in resources/views/errors/404.blade.php and it will show when you get a 404 error.
From the documentation:
Custom HTTP Error Pages
Laravel makes it easy to return custom error pages for various HTTP
status codes. For example, if you wish to customize the error page for
404 HTTP status codes, create a resources/views/errors/404.blade.php.
This file will be served on all 404 errors generated by your
application.
The views within this directory should be named to match the HTTP
status code they correspond to.
https://laravel.com/docs/5.2/errors#custom-http-error-pages
You can always go a step further by utilising the exception handler and handling exceptions the way you desire by customising the render() method
https://laravel.com/docs/5.2/errors#the-exception-handler
For example, if you wanted to handle file not found error, Exceptions\Handler.php
public function render($request, Exception $e)
{
if ($e instanceof \Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException) {
return response()->view('errors/exceptions/file-not-found', [], 500);
}
return parent::render($request, $e);
}

Answer 2

You can create custom error 404 page. If someone will enter wrong URL in a browser, he will see that page.
Also, you can redirect user manually to this page with:
abort(404);
Update
I guess the problem is here:
Route::get('{slug?}', 'PageController#getView');
You're using this three times, try to remove all of them.
The thing is when Laravel doesn't find any routes, it takes {slug} and passes it to the PageController, so when you enter http://example.com/sometext, you will be transferred to the PageController with slug = sometext.
If you do not want to remove it, check for slug inside a controller and if slug means something - good. If not, just abort(404); and user will be transferred to an error page.
Also, if you're on 5.2.27 of higher, remove web middleware from routes.php (it applies automatically, and manual apply can cause errors and strage behavior).