WordPress paginate_links - how to use it?

Question

I want to add a numberic pagination to a page with its child pages. This is the pagination I would want to create (from bootstrap):

Answer 1

Pagination Like : Prev 1 2 3 Next

<?php 
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;

$data= new WP_Query(array(
    'post_type'=>'YOUR_POST_TYPE', // your post type name
    'posts_per_page' => 3, // post per page
    'paged' => $paged,
));

if($data->have_posts()) :
    while($data->have_posts())  : $data->the_post();
            // Your code
    endwhile;

    $total_pages = $data->max_num_pages;

    if ($total_pages > 1){

        $current_page = max(1, get_query_var('paged'));

        echo paginate_links(array(
            'base' => get_pagenum_link(1) . '%_%',
            'format' => '/page/%#%',
            'current' => $current_page,
            'total' => $total_pages,
            'prev_text'    => __('« prev'),
            'next_text'    => __('next »'),
        ));
    }
    ?>    
<?php else :?>
<h3><?php _e('404 Error&#58; Not Found', ''); ?></h3>
<?php endif; ?>
<?php wp_reset_postdata();?>

Could you please try above code? I think it's helpful for you.