Apply Custom ul>li Pagination in WordPress

ul_pagination.php

<?php
function saasland_pagination() {

    global $wp_query;

    if ( $wp_query->max_num_pages <= 1 ) return;

    $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',
    ) );
    if( is_array( $pages ) ) {
        $paged = ( get_query_var('paged') == 0 ) ? 1 : get_query_var('paged');
        echo '<ul class="list-unstyled page-numbers shop_page_number">';
        foreach ( $pages as $page ) {
            echo "<li>$page</li>";
        }
        echo '</ul>';
    }
}