Wordpress navigation in Bootstrap style

someTemplate.phtml

// Usage in a template
\YourCompany\Helpers\Pagination::render(get_query_var('paged'), $loop->max_num_pages);

WP_BootstrapNavigation.php

<?php

/**
 * Class for rendering Wordpress navigation in Bootstrap style
 */

namespace YourCompany\Helpers;

Class Pagination
{

	public static function render($paged, $max_num_pages, $echo = true)
	{
		$largerInt = 999999999; // need an unlikely integer
		$pages = paginate_links([
			'base'      => str_replace($largerInt, '%#%', esc_url(get_pagenum_link($largerInt))),
			'format'    => '?paged=%#%',
			'current'   => max(1, $paged),
			'total'     => $max_num_pages,
			'type'      => 'array',
			'prev_next' => true,
			'prev_text' => __('« Prev'),
			'next_text' => __('Next »'),
		]);

		if (is_array($pages)) {
			$paged = ($paged == 0) ? 1 : $paged;

			$pagination = '<ul class="pagination">';
			foreach ($pages as $page) {
				//$page = strip_tags($page);
				$pagination .= '<li class="page-item">' . str_replace('page-numbers', 'page-link', $page) . '</li>';
			}
			$pagination .= '</ul>';

			if ($echo) {
				echo $pagination;
			} else {
				return $pagination;
			}
		}
	}
}

Hi , you can add this line to test if link is active .
$current_class = strpos($page, 'current') ? 'active' : '';
then adding this class to li .
Thanks for sharing your code with us