check id logged in symfony code example

Example: symfony 5 user management

{# templates/base.html.twig #}
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>{% block title %}Welcome!{% endblock %}</title>
    <link
      rel="stylesheet"
      href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"
    />
    {% block stylesheets %}{% endblock %}
  </head>
  <body>
    <nav
      class="navbar navbar-expand-lg navbar-light bg-light"
      style="height: 70px;"
    >
      <a class="navbar-brand" href="#">Symfony</a>
      <div class="collapse navbar-collapse" id="navbarSupportedContent"></div>
      <ul class="nav navbar-nav navbar-right">
        {% if app.user %}
        <li><a class="nav-link" href="{{ path('list') }}">View List</a></li>
        <li><a class="nav-link" href="{{ path('app_logout') }}">Logout</a></li>
        {% else %}
        <li><a class="nav-link" href="{{ path('app_login') }}">Login</a></li>
        <li>
          <a class="nav-link" href="{{ path('registration') }}">Register</a>
        </li>
        {% endif %}
      </ul>
    </nav>
    {% block body %}{% endblock %} {% block javascripts %}{% endblock %}
  </body>
</html>

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