在 Laravel 中设置会话变量

Question

I would like to set a variable in the session using laravel this way

Session::set('variableName')=$value;

but the problem is that I don't know where to put this code, 'cause I would like to set it for one time (when the guest visite the home page or any other page)? The main idea is to use a global variable to use it in all application controllers, I heared about something related to configuration variables but I'm not sure if it will be a good Idea to use config variables or only the session? Thanks

Answer 1

The correct syntax for this is:

Session::set('variableName', $value);

For Laravel 5.4 and later, the correct method to use is put :

Session::put('variableName', $value);

To get the variable, you would use:

Session::get('variableName');

If you need to set it once, I'd figure out when exactly you want it set and use Events to do it.

For example, if you want to set it when someone logs in, you'd use:

Event::listen('auth.login', function() {
    Session::set('variableName', $value);
});

Answer 2

I think your question ultimately can be boiled down to this:

Where can I set a long-lived value that is accessible globally in my application?

The obvious answer is that it depends. What it depends on are a couple of factors:

• Will the value ever be different, or is it going to be the same for everybody?
• How long exactly is long-lived? (Forever? A Day? One browsing 'session'?)

Config

If the value is the same for everyone and will seldom change, the best place to probably put it is in a configuration file somewhere underneath app/config , eg app/config/companyname.php :

<?php
return [
    'somevalue' => 10,
];

You could access this value from anywhere in your application via Config::get('companyname.somevalue')

Session

If the value you are intending to store is going to be different for each user, the most logical place to put it is in Session . This is what you allude to in your question, but you are using incorrect syntax. The correct syntax to store a variable in Session is:

Session::put('somekey', 'somevalue');

The correct syntax to retrieve it back out later is:

Session::get('somekey');

As far as when to perform these operations, that's a little up to you. I would probably choose a route filter if on Laravel 4.x or Middleware if using Laravel 5. Below is an example of using a route filter that leverages another class to actually come up with the value:

// File: ValueMaker.php (saved in some folder that can be autoloaded)
class ValueMaker
{
    public function makeValue()
    {
        return 42;
    }
}

// File: app/filters.php is probably the best place
Route::filter('set_value', function() {
    $valueMaker = app()->make('ValueMaker');
    Session::put('somevalue', $valueMaker->makeValue());
});

// File: app/routes.php
Route::group(['before' => 'set_value'], function() {
   // Value has already been 'made' by this point. 
   return View::make('view')
       ->with('value', Session::get('somevalue'))
   ;
});

Answer 3

In Laravel 5.6, you will need to set it as:

session(['variableName' => $value]);

To retrieve it, is as simple as:

$variableName = session('variableName');

Answer 4

For example, 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');

or

// Via the global helper...
session(['key' => 'value']);

for retrieving an item from the session, you can use get :

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

or global session helper :

$value = session('key', 'default value');

To determine if an item is present in the session, you may use the has method:

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

Answer 5

in Laravel 5.4

use this method:

Session::put('variableName', $value);

Answer 6

To add to the above answers, ensure you define your function like this:

public function functionName(Request $request)  {
       //
}

Note the "(Request $request)", now set a session like this:

$request->session()->put('key', 'value');

And retrieve the session in this way:

$data = $request->session()->get('key');

To erase the session try this:

$request->session()->forget('key');  

or

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

Answer 7

You can try

 Session::put('variable_Name', "Your Data Save Successfully !");  
 Session::get('variable_Name');

Answer 8

In Laravel 6.x

// 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']);

https://laravel.com/docs/6.x/session

Answer 9

to set session you can try this:

$request->session()->put('key','value');

also to get session data you can try this:

$request->session()->get('key');

If you want to get all session data:

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

Answer 10

If you want persistence sessions,

Method 1: use session()->save() or Session::save()

session(['key' => 'value']);
//or
session()->put('key', 'value');

//then
session()->save();

echo session('key');

Method 2: Move bellow line from protected $middlewareGroups of app\\Http\\Kernel.php to protected $middleware array as first line

\Illuminate\Session\Middleware\StartSession::class,

Make sure the storage directory has write permission

chmod -R a+rw storage/

Don't use dd() to verify session, use print_r()