Missing Author Information

Question

I am having trouble displaying the author name and avatar on my single.php page. The posts load fine and all the correct information is available. However the avatar and name is no where to be found. I'm not sure what I'm doing wrong. Help is appreciated

<div class="row">
    <div>
        <h1 class="primary-color"> <?php the_title(); ?></h1>
        <span class="avatar">
            <?php echo get_avatar( $id_or_email, 30, $default, $alt, $args ); ?>
        </span>
        by <span class="primary-color"><?php echo get_the_author_meta('display_name', $author_id); ?></span> <span class="pipe">|</span> <span class="date"><?php echo get_the_date(); ?></span>
    </div>
</div><!-- END ROW -->

<div class="row">
    <?php
        while ( have_posts() ) : the_post();
    ?>

    <?php the_content(); ?>

    <?php endwhile; ?>
</div>

Answer 1

To display the author's avatar within The Loop use get_avatar() like that:

<?php print get_avatar(get_the_author_meta('ID'), '30', '', '', ['class' => 'foo-bar']); ?>

To display the author's display name within The Loop use the_author():

<?php the_author(); ?>

---

So put everything inside The Loop and then:

<?php
while (have_posts()) : the_post();
  ?>

  <div class="row">
    <div>
      <h1 class="primary-color">
        <?php the_title(); ?>
      </h1>
      <span class="avatar">
        <?php print get_avatar(get_the_author_meta('ID'), '30', '', '', ['class' => 'foo-bar']); ?>
      </span>
      by <span class="primary-color"><?php the_author(); ?></span>
      <span class="pipe">|</span>
      <span class="date"><?php echo get_the_date(); ?></span>
    </div>
  </div>

  <div class="row">
    <?php the_content(); ?>
  </div>

<?php endwhile; ?>

Answer 2

Seems like you are using author info outside the loop. If you want to get that information outside the loop, you can do it as follows, in your single.php (or if you're using page template use inside it)

<?php
global $post;
$author_id = $post->post_author;
?>

<span class="avatar">
  <?php echo get_avatar($author_id, 32); ?>
</span>
by
<span class="primary-color">
  <?php the_author_meta('user_nicename', $author_id); ?>
</span>
<span class="pipe">|</span>
<span class="date"><?php echo get_the_date(); ?></span>