Add a custom greeting to registered users in the sidebar

If you allow people to sign up for your blog to comment or even contribute, here’s a simple snippet of code that you can place in your sidebar.php file to display a custom welcome greeting to your users. Visitors who are not logged in see the Log In or Register greeting. Cool, huh?

<?php
   if (is_user_logged_in()) {
      $user = wp_get_current_user();
      echo 'Welcome back <strong>'.$user->display_name.'</strong>!';
   } else { ?>
      Please <strong><?php wp_loginout(); ?></strong>
      or <a href="<?php echo get_option('home'); ?>/wp-login.php?action=register"> <strong>Register</strong></a>
<?php } ?>

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