Simple User Listing (with search)

simple-user-listing.php

<?php
/*
Plugin Name: Simple User Listing
Plugin URI: http://cozmoslabs.com
description: >-
  Create a simple shortcode to list our WordPress users.
Author: Cristian Antohe
Version: 0.1
Author URI: http://cozmoslabs.com
*/

function sul_user_listing($atts, $content = null) {
  global $post;

  extract(shortcode_atts(array(
    "role" => '',
    "number" => '10'
  ), $atts));

  $role = sanitize_text_field($role);
  $number = sanitize_text_field($number);

  // We're outputting a lot of HTML, and the easiest way 
  // to do it is with output buffering from PHP.
  ob_start();

  // Get the Search Term
  $search = ( isset($_GET["as"]) ) ? sanitize_text_field($_GET["as"]) : false ;

  // Get Query Var for pagination. This already exists in WordPress
  $page = (get_query_var('paged')) ? get_query_var('paged') : 1;

  // Calculate the offset (i.e. how many users we should skip)
  $offset = ($page - 1) * $number;

  if ($search){
    // Generate the query based on search field
    $my_users = new WP_User_Query( 
      array( 
        'role' => $role, 
        'search' => '*' . $search . '*' 
      ));
  } else {
    // Generate the query 
    $my_users = new WP_User_Query( 
      array( 
        'role' => 'author', 
        'offset' => $offset ,
        'number' => $number
      ));
  }

  // Get the total number of authors. Based on this, offset and number 
  // per page, we'll generate our pagination.

  $total_authors = $my_users->total_users;

  // Calculate the total number of pages for the pagination
  $total_pages = intval($total_authors / $number) + 1;

  // The authors object.

  $authors = $my_users->get_results();
?>

  <div class="author-search">
  <h2>Search authors by name</h2>
    <form method="get" id="sul-searchform" action="<?php the_permalink() ?>">
      <label for="as" class="assistive-text">Search</label>
      <input type="text" class="field" name="as" id="sul-s" placeholder="Search Authors" />
      <input type="submit" class="submit" name="submit" id="sul-searchsubmit" value="Search Authors" />
    </form>
  <?php 
  if($search){ ?>
    <h2 >Search Results for: <em><?php echo $search; ?></em></h2>
    <a href="<?php the_permalink(); ?>">Back To Author Listing</a>
  <?php } ?>

  </div><!-- .author-search -->

<?php if (!empty($authors))   { ?>
  <ul class="author-list">
<?php
  // loop through each author
  foreach($authors as $author){
    $author_info = get_userdata($author->ID);
    ?>
    <li>
      <?php echo get_avatar( $author->ID, 90 ); ?> 
      <h2><a href="<?php echo get_author_posts_url($author->ID); ?>"><?php echo $author_info->display_name; ?></a> - <?php echo count_user_posts( $author->ID ); ?> posts</h2>
      <p><?php echo $author_info->description; ?></p>
      <?php $latest_post = new WP_Query( "author=$author->ID&post_count=1" ); 
      if (!empty($latest_post->post)){ ?>
      <p><strong>Latest Article:</strong>
      <a href="<?php echo get_permalink($latest_post->post->ID) ?>">
        <?php echo get_the_title($latest_post->post->ID) ;?>
      </a></p>
      <?php } //endif ?>
      <p><a href="<?php echo get_author_posts_url($author->ID); ?> ">Read <?php echo $author_info->display_name; ?> posts</a></p>
    </li>
    <?php
  }
?>
  </ul> <!-- .author-list -->
<?php } else { ?>
  <h2>No authors found</h2>
<? } //endif ?>


  
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  <nav id="nav-single" style="clear:both; float:none; margin-top:20px;">
    <h3 class="assistive-text">Post navigation</h3>
    <?php if ($page != 1) { ?>
      <span class="nav-previous"><a rel="prev" href="<?php the_permalink() ?>page/<?php echo $page - 1; ?>/"><span class="meta-nav">←</span> Previous</a></span>
    <?php } ?>

    <?php if ($page < $total_pages ) { ?>
      <span class="nav-next"><a rel="next" href="<?php the_permalink() ?>page/<?php echo $page + 1; ?>/">Next <span class="meta-nav">→</span></a></span>
    <?php } ?>
  </nav>

  <?php 
  // Output the content.
  $output = ob_get_contents();
  ob_end_clean();

  // Return only if we're inside a page. This won't list anything on a post or archive page.

  if (is_page()) return  $output;

}

// Add the shortcode to WordPress. 
add_shortcode('userlisting', 'sul_user_listing');
?>