Sessions ¶
Symfony provides a session object and several utilities that you can use to store information about the user between requests.
Configuration ¶
Sessions are provided by the HttpFoundation component, which is included in all Symfony applications, no matter how you installed it. Before using the sessions, check their default configuration:
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YAML
YAML
-
XML
XML
-
PHP
PHP
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# config/packages/framework.yaml
framework:
# Enables session support. Note that the session will ONLY be started if you read or write from it.
# Remove or comment this section to explicitly disable session support.
session:
# ID of the service used for session storage
# NULL means that Symfony uses PHP default session mechanism
handler_id: null
# improves the security of the cookies used for sessions
cookie_secure: auto
cookie_samesite: lax
storage_factory_id: session.storage.factory.native
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Setting the handler_id
config option to null
means that Symfony will
use the native PHP session mechanism. The session metadata files will be stored
outside of the Symfony application, in a directory controlled by PHP. Although
this usually simplifies things, some session expiration related options may not
work as expected if other applications that write to the same directory have
short max lifetime settings.
If you prefer, you can use the session.handler.native_file
service as
handler_id
to let Symfony manage the sessions itself. Another useful option
is save_path
, which defines the directory where Symfony will store the
session metadata files:
-
YAML
YAML
-
XML
XML
-
PHP
PHP
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# config/packages/framework.yaml
framework:
session:
# ...
handler_id: 'session.handler.native_file'
save_path: '%kernel.project_dir%/var/sessions/%kernel.environment%'
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Check out the Symfony config reference to learn more about the other available Session configuration options. You can also store sessions in a database.
Basic Usage ¶
The session is available through the Request
object and the RequestStack
service. Symfony injects the request_stack
service in services and controllers
if you type-hint an argument with RequestStack:
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use Symfony\Component\HttpFoundation\RequestStack;
class SomeService
{
private $requestStack;
public function __construct(RequestStack $requestStack)
{
$this->requestStack = $requestStack;
// Accessing the session in the constructor is *NOT* recommended, since
// it might not be accessible yet or lead to unwanted side-effects
// $this->session = $requestStack->getSession();
}
public function someMethod()
{
$session = $this->requestStack->getSession();
// stores an attribute in the session for later reuse
$session->set('attribute-name', 'attribute-value');
// gets an attribute by name
$foo = $session->get('foo');
// the second argument is the value returned when the attribute doesn't exist
$filters = $session->get('filters', []);
// ...
}
}
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Stored attributes remain in the session for the remainder of that user's session. By default, session attributes are key-value pairs managed with the AttributeBag class.
Avoid Starting Sessions for Anonymous Users ¶
Sessions are automatically started whenever you read, write or even check for the existence of data in the session. This may hurt your application performance because all users will receive a session cookie. In order to prevent that, you must completely avoid accessing the session.
More about Sessions ¶
- Store Sessions in a Databaseセッションをデータベースに保存する
- Making the Locale "Sticky" during a User's Sessionユーザーのセッション中にロケールを「スティッキー」にする
- Bridge a legacy Application with Symfony SessionsSymfony セッションを使用してレガシー アプリケーションをブリッジする
- Session Proxy Examplesセッション プロキシの例
- Configuring the Session TTLセッション TTL の設定