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# Overview

Session provides a consistent API for request-scoped state, flash messages, and session ID management.

Use it when you need to persist small values between requests without coupling your code to raw `$_SESSION` access. Stored values are serialized and encrypted through the Encryption package, so session data round-trips as PHP values while backend storage stays opaque.

## What it provides

* `Quantum\Session\Session` wrapper
* `session()` helper as the standard entry point
* adapter selection via config (`native` or `database`)

## Quick example

```php
session()->set('user_id', 42);

if (session()->has('user_id')) {
    $userId = session()->get('user_id');
}

session()->setFlash('status', 'Profile updated');
```

## Adapter model

Supported adapter names:

* `native`
* `database`

When no adapter is passed, Session uses `session.default` from `config/session.php`.

## Operational constraints

* `session()` reuses one `Session` wrapper per adapter inside the current process.
* `has()` treats empty-like values as missing (`null`, `false`, `0`, `'0'`, `''`).
* `get()` depends on `has()`, so those values resolve as `null`.
* Use Session APIs for reads and writes instead of relying on backend storage format.
* Regenerate session IDs after authentication or privilege changes.


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