By default, WordPress is limited to only one author per post, and this limitation carries over to themes.

PublishPress Authors can extend WordPress to support multiple authors and guest on each post. In this guide, we show ways to display these authors.

However, PublishPress Authors is limited to how much it can customize the default WordPress byline on posts. This image shows a typical byline:

Author Byline
Author Byline

Modifying this byline is difficult because the bylines are loaded from theme files. Generally, we recommend disabling the byline and using another display option.

However, this tutorial will show you how to customize the author byline if you are using a commercial theme or a theme from

Using your own custom theme #

If you are using your own custom WordPress theme, then all you need to do is include this code to show the new PublishPress Authors byline:

<?php do_action( 'pp_multiple_authors_show_author_box' ); ?>

If you want to closely mimic the default WordPress byline, you can can add these two extra filters:

<?php do_action('pp_multiple_authors_show_author_box', false, 'inline'); ?>

Using a Commercial Theme or one from #

If you are using a theme developed by a commercial developer, the best way to add PublishPress Authors support to your theme is using a child theme. This post has details on creating a child theme. We don’t advise you customize the main theme, because the changes would be overwritten on every update. We do provide some child themes for some commercial themes.

The short version of this tutorial is that we need to replace the normal authors byline in our theme with this code:

<?php do_action( 'pp_multiple_authors_show_author_box' ); ?>

You can drop that code almost anywhere in your WordPress theme files and it will work.

The longer version of this tutorial is that creating a 100% replacement for the default byline will require some detective work. Ever theme is different and we need to find out which template file we need to modify or override.

In many cases, you can add this PHP snippet directly into the main template file for posts. This file often has a name such as single.php or singular.php.

If the location of the author byline isn't obvious, you can use the browser to inspect the page, looking for an element with name like this:

  • byline
  • post-author

If you are using Chrome, you can right click on the author byline and check the markup. Here is an example from the Twenty Twenty theme:

Twenty Twenty
Twenty Twenty

For the Twenty Nineteen theme, this image shows the markup:

Twenty Nineteen
Twenty Nineteen

Alternatively, you can use your code editor to search for “author” or “byline”. I’m using PHPStorm in the image below, and it quickly points me to the correct file:

We found out that the template file we need to modify is “wp-content/themes/twentynineteen/inc/template-tags.php”.

If you want to, you can simple modify this file to include the PublishPress Authors code. This update would work:

if ( ! function_exists( 'twentynineteen_posted_by' ) ) :
	 * Prints HTML with meta information about theme author.
	function twentynineteen_posted_by() {
	do_action( 'pp_multiple_authors_show_author_box' );

However, we would recommend that you leave this file alone and override this using the functions.php file in your child theme. In this longer code snippet below, we are overriding three lines of code, starting at <span class="byline"> and ending with <span class="author vcard">. In this code, we have also added two filters to closely mimic the default byline:

function twentynineteen_posted_by()
     * This first block is specific to each theme.
    echo '<span class="byline">';
    echo twentynineteen_get_icon_svg('person', 16);
    echo '<span class="screen-reader-text">' . __('Posted by', 'twentynineteen') . '</span><span class="author vcard">';

     * This is the action that echoes the author box in the screen.
     * The action pp_multiple_authors_show_author_box accepts 4 parameters, but for this example we will be using only 2:
     * $showTitle = false
     * $layout = 'inline'
    do_action('pp_multiple_authors_show_author_box', false, 'inline');

     * This block is specific to each theme.
    echo '</span></span>';

Now you can try refreshing the page and checking the result.

In the Twenty Nineteen theme there is conditional code checking if the function “twentynineteen_posted_by” exists. If the function doesn't exist, it defines it. That means we can define it on our “functions.php” file. That way the theme will use our function instead of the one defined in the theme. If your theme doesn’t have a conditional like that, you can override the entire template file and modifying the required functions. More information in this guide.

Technical details about the WordPress author byline #

WordPress themes usually rely on functions that are designed to return data from only one author. These key functions include such as the_author(), get_the_author(), and get_the_author_meta().

PublishPress Authors can modify these functions and include the names of multiple authors. Unfortunately, this doesn't work for links to the authors' pages because HTML won't allow 2 links inside the same “<a>” tag.

So to show multiple authors we need to replace the default code.

For this reason, when you first install PublishPress Authors, the default WordPress byline will continue to show one author.