add_filter( 'request', 'area_request' ); function area_request( $query_vars ) { if ( array_key_exists( 'author_name', $query_vars ) ) { global $wpdb; $author_id = $wpdb->get_var( $wpdb->prepare( "SELECT user_id FROM {$wpdb->usermeta} WHERE meta_key='nickname' AND meta_value = %s", $query_vars['author_name'] ) ); if ( $author_id ) { $query_vars['author'] = $author_id; unset( $query_vars['author_name'] ); } } return $query_vars; } add_filter( 'author_link', 'area_author_link', 10, 3 ); function area_author_link( $link, $author_id, $author_nicename ) { $author_nickname = get_user_meta( $author_id, 'nickname', true ); if ( $author_nickname ) { $link = str_replace( $author_nicename, $author_nickname, $link ); } return $link; }