Create pagination items with a separator

pagination-with-separator.php

<?php
/**
 * Pagination with separators
 *
 * @see http://stackoverflow.com/posts/6354523/revisions
 *
 * @param $current_page
 * @param $total_pages
 * @param int $show_separator_if_more_than
 * @param string $separator
 * @param null $walker
 *
 * @return array
 */
function get_pagination_items($current_page, $total_pages, $show_separator_if_more_than = 8, $separator = '...', $walker = null)
{
    $links = array();

    if ($total_pages > $show_separator_if_more_than) {
        // Specifies range of items in the middle
        $min = max($current_page - 2, 2);
        $max = min($current_page + 2, $total_pages - 1);

        // Always show the first number
        $links[] = 1;

        // If more than one space away from the beginning, show the separator
        if ($min > 2) {
            $links[] = $separator;
        }

        // Shows the middle numbers
        for ($i = $min; $i < $max + 1; $i++) {
            $links[] = $i;
        }

        // If more than one space away from the end, show the separator
        if ($max < $total_pages - 1) {
            $links[] = $separator;
        }

        // Always show the last number
        $links[] = $total_pages;
    } else {
        // Shows the numbers
        for ($i = 1; $i <= $total_pages; $i++) {
            $links[] = $i;
        }
    }

    // Apply a walker
    if (is_callable($walker)) {
        array_walk($links, $walker);
    }

    return $links;
}