/**
 * @param WP_Query|null $wp_query
 * @param bool $echo
 *
 * @return string
 * This accept a WP_Query instance to build pagination (for custom wp_query()), 
 * or nothing to use the current global $wp_query (eg: taxonomy term page)
 */
function bootstrap_pagination( \WP_Query $wp_query = null, $echo = true) {

	if(null === $wp_query){
		global $wp_query;
	}

	$pages = paginate_links( array(
			'base'         => str_replace( 999999999, '%#%', esc_url( get_pagenum_link( 999999999 ) ) ),
			'format' => '?paged=%#%',
			'current' => max( 1, get_query_var('paged') ),
			'total' => $wp_query->max_num_pages,
			'type'  => 'array',
			'show_all'     => false,
			'end_size'     => 3,
			'mid_size'     => 1,
			'prev_next'   => true,
			'prev_text'    => __('« Prev'),
			'next_text'    => __('Next »'),
			'add_args'     => false,
			'add_fragment' => ''
		)
	);

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

		$pagination = '<div class="pagination"><ul class="pagination">';

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

		$pagination .= '</ul></div>';

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