chickadee/admin-bar-partial.php

<?php session_start(); ?>
<?php if ( isset( $_SESSION["user"] ) ): ?>

<nav class="admin-bar">
  <ul>
    <li><a href="admin.php">Admin Area</a>
    <li><a href="admin.php?logout=1">Log Out</a>
  </ul>
</nav>

<?php endif; ?>