Numeric Page Navigation for Roots Sage Theme

numeric-page-navi.php

// Numeric Page Navi
function page_navi($before = '', $after = '')
{
    global $wpdb, $wp_query;
    $request        = $wp_query->request;
    $posts_per_page = intval(get_query_var('posts_per_page'));
    $paged          = intval(get_query_var('paged'));
    $numposts       = $wp_query->found_posts;
    $max_page       = $wp_query->max_num_pages;
    if ($numposts <= $posts_per_page) {return;}
    if (empty($paged) || $paged == 0) {
        $paged = 1;
    }
    $pages_to_show         = 10;
    $pages_to_show_minus_1 = $pages_to_show - 1;
    $half_page_start       = floor($pages_to_show_minus_1 / 2);
    $half_page_end         = ceil($pages_to_show_minus_1 / 2);
    $start_page            = $paged - $half_page_start;
    if ($start_page <= 0) {
        $start_page = 1;
    }
    $end_page = $paged + $half_page_end;
    if (($end_page - $start_page) != $pages_to_show_minus_1) {
        $end_page = $start_page + $pages_to_show_minus_1;
    }
    if ($end_page > $max_page) {
        $start_page = $max_page - $pages_to_show_minus_1;
        $end_page   = $max_page;
    }
    if ($start_page <= 0) {
        $start_page = 1;
    }

    echo $before . '<nav aria-label="Page navigation"><ul class="pagination">' . "";

    $prevposts = get_previous_posts_page_link();
    if ($prevposts) {echo '<li class="page-item"><a href="' . $prevposts . '" class="page-link">
        <span aria-hidden="true">&laquo;</span>
    <span class="sr-only">Previous</span></a></li>';}

    for ($i = $start_page; $i <= $end_page; $i++) {
        if ($i == $paged) {
            echo '<li class="active page-item"><a href="#" class="page-link">' . $i . '</a></li>';
        } else {
            echo '<li class="page-item"><a href="' . get_pagenum_link($i) . '" class="page-link">' . $i . '</a></li>';
        }
    }
    $nextposts = get_next_posts_page_link();
    // echo $nextposts;
    if ($nextposts && $paged < $max_page) {echo '<li class="page-item"><a href="' . $nextposts . '" class="page-link">
        <span aria-hidden="true">&raquo;</span>
    <span class="sr-only">Next</span></a></li>';}
    echo '</ul></nav>' . $after . "";
}