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Within a post I can use the_author() to retrieve the author name, but in the sidebar of a single-post page this does not return anything. How to get metadata on the post author outside the post?

  • Be careful with those template tags. Some are intended for use inside the Loop and do not work reliably outside it. Check the Codex if aren't sure. – s_ha_dum Mar 24 '13 at 17:37
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Test whether on a single post. If so, get a user object by the current posts' author ID and echo its display_name property:

if ( is_single() ) {
    global $post;

    $author = get_userdata( $post->post_author );
    echo $author->display_name;
}

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