WordPress: get author info from post id

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Or even the author id from the post id. I am trying to return the author meta (author page link and avatar) in the sidebar of a single post page (outside of the post loop). What is the best way to do this? I am using a custom function (see below) to return the post id, but am not sure what function to call next. 

function this_post_id() {
  global $wp_query;
  $thePostID = $wp_query->post->ID;
  return $thePostID;
}
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5 comments

  1. I figured it out. 

    <?php $author_id=$post->post_author; ?>
<img src="<?php the_author_meta( 'avatar' , $author_id ); ?> " width="140" height="140" class="avatar" alt="<?php echo the_author_meta( 'display_name' , $author_id ); ?>" />
<?php the_author_meta( 'user_nicename' , $author_id ); ?>

  2. If you want it outside of loop then use the below code.

    <?php
$author_id = get_post_field ('post_author', $post_id);
$display_name = get_the_author_meta( 'display_name' , $author_id ); 
echo $display_name;
?>

  4. <?php
  $field = 'display_name';
  the_author_meta($field);
?>

    Valid values for the $field parameter include:

    • admin_color
    • aim
    • comment_shortcuts
    • description
    • display_name
    • first_name
    • ID
    • jabber
    • last_name
    • nickname
    • plugins_last_view
    • plugins_per_page
    • rich_editing
    • syntax_highlighting
    • user_activation_key
    • user_description
    • user_email
    • user_firstname
    • user_lastname
    • user_level
    • user_login
    • user_nicename
    • user_pass
    • user_registered
    • user_status
    • user_url
    • yim

  5. This should work

    • Post ID
    $post_id =  get_the_ID();
$author_id = get_post_field ('post_author', $post_id);
$display_name = get_the_author_meta( 'nickname' , $author_id ); 
echo $display_name;

    Note: You need to use this function inside the loop.