Bootstrap v4-alpha6 Pagination for WordPress

fix formatting for Bootstrap v4 anchor display

/*
 * custom pagination with bootstrap .pagination class
 * source: http://www.ordinarycoder.com/paginate_links-class-ul-li-bootstrap/
 */
function bootstrap_pagination( $echo = true ) {
	global $wp_query;

	$big = 999999999; // need an unlikely integer

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

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

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

		foreach ( $pages as $page )
		{
			// bootstrap-specific class replacements/additions
			//
			$page = str_replace('page-numbers', 'page-numbers page-link', $page);

			if ( strpos($page, 'current') )
			{
				$page = str_replace('current', '', $page);
				$li_class = 'page-item active';
			}
			else
			{
				$li_class = 'page-item';
			}
			//
			// end replacements/additions

			$pagination .= "<li class='$li_class'> $page </li>";
		}

		$pagination .= '</ul>';

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