Class 'App\Http\Controllers\Db' Not Found and I Also Cannot Use a New Model

Class 'App\Http\Controllers\DB' not found and I also cannot use a new Model

The problem here are PHP namespaces. You need to learn how to use them. As your controller are in App\Http\Controllers namespace, if you refer any other class, you need to add leading backslash (or proper namespace) or add use statement at the beginning of file (before class definition).

So in your case you could use:

$headquote = \DB::table('quotation_texts')->find(176);
$headquote = \App\Quotation::find(176);

or add in your controller class use statement so the beginning of your controller class could look like this:

<?php

namespace App\Http\Controllers;

use DB;
use App\Quotation;

For more information about namespaces you could look at How to use objects from other namespaces and how to import namespaces in PHP or namespaces in PHP manual

Class 'App\Http\Controllers\DB' not found in Laravel 5 Controller

DB is not in your current namespace App\Http\Controllers. So you can either import it at the top

use DB;

or precede it with a backslash \DB::table(...). This solves the class not found exception.

You are however not getting a Laravel Collection of Employee models but an array of database rows. Arrays are not objects that have a count() function which results in your final error.

Update: Laravel 5.3 will return a Collection object and not an array. So count() will work on that.

Class 'App\Http\Controllers\DB' not found

Add use DB; to your Controller.

Class 'App\Http\Controllers\Session' not found in Laravel 5.2

From the error message:

Class 'App\Http\Controllers\Session' not found

I see that Laravel is searching the Session class in the current namespace: App\Http\Controllers

The problem is you don't have aliased the class from the global namespace: Session is a Facade, and all the facades are in the global namespace

To use the class from the global namespace, put:

use Session;

on top of your controller, after your namespace declaration

Alternatively, you can call the class from the global namespace with:

\Session::get('panier');  

Laravel Error Class 'App\Http\Controllers\DateTime' not found

Above your class definition, import the class with a use statement.

use DateTime;

The alternative to that is to use the fully qualified namespace in your code. With PHP classes in the global namespace, all this means is a single backslash before the class name:

$expires = new \DateTime('NOW');

I prefer the first approach, as it allows you to see every class used in that file at a glance.

laravel Class 'App\Categories' not found

Because models are autoloading via composer

in some cases you need to run
composer dump-autoload after changes in order to make it work

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