How laravel `Auth:user()` or `Auth:id()` works

Question

How laravel Auth:user() or Auth:id() works

Is it resides in session or database.

I searched but not get good article.

Please help to understand. I know I will get many down-votes ;)

Solution 1

Did you read this? Its a good guide to start with

https://laravel.com/docs/5.4/authentication

Solution 2

Here's my attempt at figuring out what actually happens on an Auth::user() call:

Auth::user()

Illuminate\Support\Facades\Auth
extends Illuminate\Support\Facades\Facade

Facade::__callStatic('user')

static::getFacadeRoot()

resolveFacadeInstance(static::getFacadeAccessor == 'auth' (from Auth class))

return static::$app[$name];
static::$app is instance of Illuminate\Foundation\Application
extends Illuminate\Container\Container

which implements ArrayAccess (which is why $obj[] syntax works)

Container::offsetGet(auth)

Application::make(auth) 

Container::getAlias(auth) return 'auth'

Container::make(auth)

Container::resolve(auth)

yadda, yadda, yadda See in Application::registerCoreContainerAliases

'auth' = Illuminate\Auth\AuthManager

AuthManager::user() = AuthManager::__call = $this->guard()->user()

AuthManager::guard(web)

AuthManager::resolve(web) (see config/auth.php)

AuthManager::createSessionDriver() returns new Illuminate\Auth\SessionGuard

SessionGuard::user() // <---- this is what actually get's called, based on default config

Solution 3

You can find this method in Auth\SessionGuard class :

Authenticatable|null user()

Get the currently authenticated user.

Return Value Authenticatable|null

Check it out: https://laravel.com/api/5.7/Illuminate/Auth/SessionGuard.html#method_user

Solution 4

laravel uses session for authentication.if you are beginer in laravel then must read following link:

https://laravel.com/docs/5.4/authentication

i think its help you

View more solutions

Comments

[Rob]

This doesn't really answer the question of "how". When I look at that class (vendor/laravel/framework/src/Illuminate/Support/Facades/Aut‌​h.php) it has two methods, neither of which are user(), and extends an abstract class (Facade) that likewise doesn't have a user() method. And I don't see how the __callStatic method would do anything outside of those two classes either. HOW exactly does Auth::user() work?

[fignet]

I had this question too and this answer really helped. I needed to figure out whether Auth::user() and Auth::id() retrieved the details from the database or session. From reading the source of SessionGuard::user() and SessionGuard::id() it appears: 1. The value is reused from memory if this call has been made previously within the current request. 2. The value is called from the proper provider (Which is often the db) if it is not currently in memory. 3. For Auth::id the value is exclusively pulled from the Session. Note that if you use the DB for sessions this is irrelevant.