Echo author ID in author.php

Try this code. $author = get_user_by( ‘slug’, get_query_var( ‘author_name’ ) ); echo $author->ID; Alternatively, if author name has not been set use: if ( $author_id = get_query_var( ‘author’ ) ) { $author = get_user_by( ‘id’, $author_id ); } credit @AndyAdams in the easily missed comments bellow