Displaying a random user with a shortcode

I’m trying to setup a shortcode to show a single random user each time the page is refreshed. I’ve been successful in displaying all users or a select user by the user ID.

Here is my shortcode as it is now:

//* Shortcode for getting users
function list_of_users( $atts ) {

    extract( shortcode_atts(
            'display' => 'all',
            'user' => '30'

    switch ( $display ) {
        case 'all':
            $content = display_all_users();
        case 'single':
            $content = display_single_user( (int) $user );
        case 'rotate':
            $content = display_rotate_users();
    return $content;
add_shortcode('staff', 'list_of_users');

Here’s the function to display all users:

function display_all_users(){ 
    $args = array(
        'orderby' => 'ID',
        'order' => 'ASC'
    $users = get_users( $args );

    $html = '<ul class="staff">';
        foreach( $users as $user ){ 
            $user_info = get_userdata($user->ID);
            $html .= '<li>';
            $html .= '<a href="'.get_home_url().'/author/'.$user_info->user_nicename.'" class="staff-image">';
            $html .= mt_profile_img( $user->ID, array('size' => '250x250','echo' => false));
            $html .= '</a>';
            $html .= '<div class="staff-info"><a href="'.get_home_url().'/author/'.$user_info->user_nicename.'" class="staff-name"><h2>'.$user->display_name.'</h2></a>';
            $html .= '<div class="service-certs">';
            $html .= get_field('certifications','user_'.$user->ID);
            $html .= '</div>';
            $html .= '<p class="service-excerpt">';
            $html .= get_field('short_bio','user_'.$user->ID);
            $html .= '</p>';
            $html .= '<a href="'.get_home_url().'/author/'.$user_info->user_nicename.'" class="more-staff-bio">Read more from ' . $user_info->user_firstname . '</a></div><div style="clear: both;"></div>';
            $html .= '</li>';
    $html .= '</ul>';
    return $html;

Here’s the function to show a single user by ID:

function display_single_user( $user_id = 30 ){

    $html = '<div class="home-profile-image">';
    $html .=  mt_profile_img( $user_id, array('size' => '175x175','echo' => false));
    $html .= '</div><div class="home-short-bio">';
    $html .=  get_field('short_bio','user_'.$user_id);
    $html .= '</div><a href="'.get_home_url().'/our-team/" class="button">Read more staff bios</a>';

    return $html;

Where I’m stuck is to take the list of all users and then randomizing the user id to then use to display certain info. I would like to keep the output of the single user (above) for this random user…it’s just a matter of how to get that random ID.

Any suggestions on how to accomplish this?

Solutions Collecting From Web of "Displaying a random user with a shortcode"

By default WordPress allow only order ASC and DESC. However, you can use WP_User_Query and the action pre_user_query to adjust the query (that is passed by reference) just like you want.

This is efficient because you get only one user, not all.

function my_user_by_rand( $ua ) {
  // remove the action to run only once
  remove_action('pre_user_query', 'my_user_rand');
  // adjust the query to use random order
  $ua->query_orderby = str_replace( 'user_login ASC', 'RAND()', $ua->query_orderby );

function display_random_user(){
  // add the filter
  add_action('pre_user_query', 'my_user_by_rand');
  // setup the query
  $args = array(
    'orderby' => 'user_login', 'order' => 'ASC', 'number' => 1
  $user_query = new WP_User_Query( $args );
  // run the query
  // get the result
  $random = ! empty($user_query->results) ? array_pop($user_query->results) : FALSE;
  // just for debug

Something like this should get you a random user. Not tested.

function display_random_user(){ 
    $users = get_users();
    $user_info = get_userdata($users[array_rand($users)]->ID);
    // do stuff with info

PHP: array_rand – Manual