Wraps WordPress paginate_links data in Twitter bootstrap pagination component

functions::paginate_links_as_bootstrap.php

<?php
if ( ! function_exists('paginate_links_as_bootstrap') ) :
/**
 * paginate_links_as_bootstrap()
 * JPS 20170330
 * Wraps paginate_links data in Twitter bootstrap pagination component
 * @param array $args {
 *     Optional. {@see 'paginate_links'} for native argument list.
 *
 *     @type string $nav_class          classes for <nav> element. Default empty.
 *     @type string $ul_class           additional classes for <ul.pagination> element. Default empty.
 *     @type string $li_class           additional classes for <li> elements.
 * }
 * @return array|string|void String of page links or array of page links.
 */
function paginate_links_as_bootstrap ( $args = '' ) {
  $args['type'] = 'array';
  $defaults = array(
    'nav_class' => '',
    'ul_class'  => '',
    'li_class'  => ''
  );
  $args = wp_parse_args( $args, $defaults );
  $page_links = paginate_links( $args );

  if ( $page_links ) {
    $r = '';
    $nav_class = empty($args['nav_class']) ? '' : 'class="' . $args['nav_class'] . '"';
    $ul_class = empty($args['ul_class']) ? '' : ' ' . $args['ul_class'];
    $r .= '<nav '. $nav_class .' aria-label="navigation">' . "\n\t";
    $r .= '<ul class="pagination'. $ul_class .'">' . "\n";
    foreach ($page_links as $link) {
      $li_classes = explode(" ", $args['li_class']);
      strpos($link, 'current') !== false ? array_push($li_classes, 'active') : ( strpos($link, 'dots') !== false ? array_push($li_classes, 'disabled') : '' );
      $class = empty($li_classes) ? '' : 'class="' . join(" ", $li_classes) . '"';
      $r .= "\t\t" . '<li ' . $class . '>' . $link . '</li>' . "\n";
    }
    $r .= "\t</ul>";
    $r .= "\n</nav>";
    return $r;
  }
}
endif;