/**
* {@inheritdoc}
*/
public function jsonSerialize()
{
$expires_at = null;
if ($this->expires_at instanceof JsonSerializable) {
$expires_at = $this->expires_at->jsonSerialize();
} elseif ($this->expires_at instanceof DateTimeInterface) {
$expires_at = $this->expires_at->getTimestamp();
}
return ['session_id' => $this->session_id, 'user_id' => $this->user_id, 'expires_at' => $expires_at];
}
