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<?php
class Session
{
private static $instance = null;
private function __construct()
{
if (session_status() == PHP_SESSION_NONE)
session_start();
}
public static function get()
{
if (self::$instance == null) {
self::$instance = new Session();
}
return self::$instance;
}
public function sign_in(User $user)
{
$_SESSION['signed_in'] = true;
$_SESSION['user_id'] = $user->id;
$_SESSION['user_name'] = $user->name;
}
public function sign_out()
{
session_unset();
session_destroy();
}
public function is_signed_in(): bool
{
return isset($_SESSION['signed_in']);
}
public function get_current_user()
{
// There is no current user
if (!$this->is_signed_in()) {
return null;
}
$result = new User();
if (isset($_SESSION['user_id'])) {
$result->get_by_id($_SESSION['user_id']);
} else {
$result = null;
}
return $result;
}
}
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