How can i display avatar at wordpress single post page ?

Question

I tried to get avatar at single (post) page by these codes

  <?php
     echo get_avatar( $id_or_email, $size = '96' );
     ?>

  <?php echo get_avatar( $comment, 32 ); ?>

  <?php echo get_avatar( $id_or_email, $size, $default, $alt ); ?>

  <?php echo get_avatar( get_the_author_email(), '60' ); ?>

But no success, nothing get working. It always show default gravatar. Actually author have avatar at gravatar. But it does not show.

Can anyone please tell me correct ways to display avatar at single post page ?

Answer 1

Do you have avatars enabled at Admin/Settings/Discussion?

Also check Using Gravatars « WordPress Codex for code examples.