HTTP Session

• Introduction
  • Configuration
  • Driver Prerequisites
• Using The Session
  • Retrieving Data
  • Storing Data
  • Flash Data
  • Deleting Data
  • Regenerating The Session ID
• Adding Custom Session Drivers
  • Implementing The Driver
  • Registering The Driver

Introduction

Since HTTP driven applications are stateless, sessions provide a way to store information about the user across multiple requests. Laravel ships with a variety of session backends that are accessed through an expressive, unified API. Support for popular backends such as Memcached, Redis, and databases is included out of the box.

Configuration

The session configuration file is stored at config/session.php. Be sure to review the options available to you in this file. By default, Laravel is configured to use the file session driver, which will work well for many applications.

The session driver configuration option defines where session data will be stored for each request. Laravel ships with several great drivers out of the box:

• file - sessions are stored in storage/framework/sessions.
• cookie - sessions are stored in secure, encrypted cookies.
• database - sessions are stored in a relational database.
• memcached / redis - sessions are stored in one of these fast, cache based stores.
• array - sessions are stored in a PHP array and will not be persisted.

{tip} The array driver is used during testing and prevents the data stored in the session from being persisted.

Driver Prerequisites

Database

When using the database session driver, you will need to create a table to contain the session items. Below is an example Schema declaration for the table:

Schema::create('sessions', function ($table) {
    $table->string('id')->unique();
    $table->unsignedInteger('user_id')->nullable();
    $table->string('ip_address', 45)->nullable();
    $table->text('user_agent')->nullable();
    $table->text('payload');
    $table->integer('last_activity');
});

You may use the session:table Artisan command to generate this migration:

php artisan session:table
php artisan migrate

Redis

Before using Redis sessions with Laravel, you will need to either install the PhpRedis PHP extension via PECL or install the predis/predis package (~1.0) via Composer. For more information on configuring Redis, consult its Laravel documentation page.

{tip} In the session configuration file, the connection option may be used to specify which Redis connection is used by the session.

Using The Session

Retrieving Data

There are two primary ways of working with session data in Laravel: the global session helper and via a Request instance. First, let's look at accessing the session via a Request instance, which can be type-hinted on a controller method. Remember, controller method dependencies are automatically injected via the Laravel service container:

<?php
namespace App\Http\Controllers;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
class UserController extends Controller
{
    /**
     * Show the profile for the given user.
     *
     * @param  Request  $request
     * @param  int  $id
     * @return Response
     */
    public function show(Request $request, $id)
    {
        $value = $request->session()->get('key');
        //
    }
}

When you retrieve an item from the session, you may also pass a default value as the second argument to the get method. This default value will be returned if the specified key does not exist in the session. If you pass a Closure as the default value to the get method and the requested key does not exist, the Closure will be executed and its result returned:

$value = $request->session()->get('key', 'default');
$value = $request->session()->get('key', function () {
    return 'default';
});

The Global Session Helper

You may also use the global session PHP function to retrieve and store data in the session. When the session helper is called with a single, string argument, it will return the value of that session key. When the helper is called with an array of key / value pairs, those values will be stored in the session:

Route::get('home', function () {
    // Retrieve a piece of data from the session...
    $value = session('key');
    // Specifying a default value...
    $value = session('key', 'default');
    // Store a piece of data in the session...
    session(['key' => 'value']);
});

{tip} There is little practical difference between using the session via an HTTP request instance versus using the global session helper. Both methods are testable via the assertSessionHas method which is available in all of your test cases.

Retrieving All Session Data

If you would like to retrieve all the data in the session, you may use the all method:

$data = $request->session()->all();

Determining If An Item Exists In The Session

To determine if an item is present in the session, you may use the has method. The has method returns true if the item is present and is not null:

if ($request->session()->has('users')) {
    //
}

To determine if an item is present in the session, even if its value is null, you may use the exists method. The exists method returns true if the item is present:

if ($request->session()->exists('users')) {
    //
}

Storing Data

To store data in the session, you will typically use the put method or the session helper:

// Via a request instance...
$request->session()->put('key', 'value');
// Via the global helper...
session(['key' => 'value']);

Pushing To Array Session Values

The push method may be used to push a new value onto a session value that is an array. For example, if the user.teams key contains an array of team names, you may push a new value onto the array like so:

$request->session()->push('user.teams', 'developers');

Retrieving & Deleting An Item

The pull method will retrieve and delete an item from the session in a single statement:

$value = $request->session()->pull('key', 'default');

Flash Data

Sometimes you may wish to store items in the session only for the next request. You may do so using the flash method. Data stored in the session using this method will be available immediately and during the subsequent HTTP request. After the subsequent HTTP request, the flashed data will be deleted. Flash data is primarily useful for short-lived status messages:

$request->session()->flash('status', 'Task was successful!');

If you need to keep your flash data around for several requests, you may use the reflash method, which will keep all of the flash data for an additional request. If you only need to keep specific flash data, you may use the keep method:

$request->session()->reflash();
$request->session()->keep(['username', 'email']);

Deleting Data

The forget method will remove a piece of data from the session. If you would like to remove all data from the session, you may use the flush method:

// Forget a single key...
$request->session()->forget('key');
// Forget multiple keys...
$request->session()->forget(['key1', 'key2']);
$request->session()->flush();

Regenerating The Session ID

Regenerating the session ID is often done in order to prevent malicious users from exploiting a session fixation attack on your application.

Laravel automatically regenerates the session ID during authentication if you are using the built-in LoginController; however, if you need to manually regenerate the session ID, you may use the regenerate method.

$request->session()->regenerate();

Adding Custom Session Drivers

Implementing The Driver

Your custom session driver should implement the SessionHandlerInterface. This interface contains just a few simple methods we need to implement. A stubbed MongoDB implementation looks something like this:

<?php
namespace App\Extensions;
class MongoSessionHandler implements \SessionHandlerInterface
{
    public function open($savePath, $sessionName) {}
    public function close() {}
    public function read($sessionId) {}
    public function write($sessionId, $data) {}
    public function destroy($sessionId) {}
    public function gc($lifetime) {}
}

{tip} Laravel does not ship with a directory to contain your extensions. You are free to place them anywhere you like. In this example, we have created an Extensions directory to house the MongoSessionHandler.

Since the purpose of these methods is not readily understandable, let's quickly cover what each of the methods do:

• The open method would typically be used in file based session store systems. Since Laravel ships with a file session driver, you will almost never need to put anything in this method. You can leave it as an empty stub. It is a fact of poor interface design (which we'll discuss later) that PHP requires us to implement this method.
• The close method, like the open method, can also usually be disregarded. For most drivers, it is not needed.
• The read method should return the string version of the session data associated with the given $sessionId. There is no need to do any serialization or other encoding when retrieving or storing session data in your driver, as Laravel will perform the serialization for you.
• The write method should write the given $data string associated with the $sessionId to some persistent storage system, such as MongoDB, Dynamo, etc. Again, you should not perform any serialization - Laravel will have already handled that for you.
• The destroy method should remove the data associated with the $sessionId from persistent storage.
• The gc method should destroy all session data that is older than the given $lifetime, which is a UNIX timestamp. For self-expiring systems like Memcached and Redis, this method may be left empty.

Registering The Driver

Once your driver has been implemented, you are ready to register it with the framework. To add additional drivers to Laravel's session backend, you may use the extend method on the Session facade. You should call the extend method from the boot method of a service provider. You may do this from the existing AppServiceProvider or create an entirely new provider:

<?php
namespace App\Providers;
use App\Extensions\MongoSessionHandler;
use Illuminate\Support\Facades\Session;
use Illuminate\Support\ServiceProvider;
class SessionServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Session::extend('mongo', function ($app) {
            // Return implementation of SessionHandlerInterface...
            return new MongoSessionHandler;
        });
    }
}

Once the session driver has been registered, you may use the mongo driver in your config/session.php configuration file.