pagination.php

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<?php
$count = (int) elgg_extract('count', $vars, 0);
if (empty($count)) {
    return;
}

$offset = abs((int) elgg_extract('offset', $vars, 0));
// because you can say $vars['limit'] = 0
$limit = (int) elgg_extract('limit', $vars, elgg_get_config('default_limit'), false);

$offset_key = elgg_extract('offset_key', $vars, 'offset');
$url_fragment = elgg_extract('url_fragment', $vars, '');
$use_referer = (bool) elgg_extract('use_referer', $vars, get_input('use_referer', true));

// some views pass an empty string for base_url
if (isset($vars['base_url']) && $vars['base_url']) {
    $base_url = elgg_extract('base_url', $vars);
} elseif ($use_referer && elgg_is_xhr() && !empty($_SERVER['HTTP_REFERER'])) {
    $base_url = $_SERVER['HTTP_REFERER'];
} else {
    $base_url = elgg_get_current_url();
}

$base_url_has_fragment = preg_match('~#.~', $base_url);

$get_href = function ($offset) use ($base_url, $base_url_has_fragment, $offset_key, $url_fragment) {
    $link = elgg_http_add_url_query_elements($base_url, [$offset_key => $offset]);
    if (!$base_url_has_fragment && $offset) {
        $link .= "#$url_fragment";
    }
    
    return $link;
};

if ($count <= $limit && $offset == 0) {
    // no need for pagination
    return;
}

$total_pages = (int) ceil($count / $limit);
$current_page = (int) ceil($offset / $limit) + 1;

$pages = [];

// determine starting page
$start_page = max(min([$current_page - 2, $total_pages - 4]), 1);

// add previous
if ((bool) elgg_extract('pagination_show_previous', $vars, true) && ($current_page !== 1)) {
    $prev_offset = $offset - $limit;
    if ($prev_offset < 1) {
        // don't include offset=0
        $prev_offset = null;
    }
    
    $pages['prev'] = [
        'text' => elgg_extract('pagination_previous_text', $vars, elgg_echo('previous')),
        'href' => $get_href($prev_offset),
        'class' => 'elgg-pagination-previous',
    ];
}

// show in between page numbers
if ((bool) elgg_extract('pagination_show_numbers', $vars, true)) {
    // add first page to be listed
    if ($start_page > 1) {
        $pages[1] = [];
    }
    
    // added dotted spacer
    if (($start_page - 2) > 1) {
        $pages[] = ['text' => '...', 'disabled' => true];
    } elseif ($start_page == 3) {
        $pages[2] = [];
    }
    
    $max = 1;
    for ($page = $start_page; $page <= $total_pages; $page++) {
        if ($max > 5) {
            break;
        }
        
        $pages[$page] = [];
        $max++;
    }
    
    // added dotted spacer
    if ($total_pages > ($start_page + 6)) {
        $pages[] = ['text' => '...', 'disabled' => true];
    } elseif (($start_page + 5) == ($total_pages - 1)) {
        $pages[$total_pages - 1] = [];
    }
    
    // add last page to be listed
    if ($total_pages >= ($start_page + 5)) {
        $pages[$total_pages] = [];
    }
}

// add next
if ((bool) elgg_extract('pagination_show_next', $vars, true) && ($current_page !== $total_pages)) {
    // add next
    $next_offset = $offset + $limit;
    if ($next_offset >= $count) {
        $next_offset--;
    }
    
    $pages['next'] = [
        'text' => elgg_extract('pagination_next_text', $vars, elgg_echo('next')),
        'href' => $get_href($next_offset),
        'class' => 'elgg-pagination-next',
    ];
}

$list = '';
foreach ($pages as $page_num => $page) {
    if ($page_num == $current_page) {
        $list .= elgg_format_element('li', ['class' => 'elgg-state-selected'], "<span>{$page_num}</span>");
    } else {
        $href = elgg_extract('href', $page);
        $text = elgg_extract('text', $page, $page_num);
        $disabled = elgg_extract('disabled', $page, false);
        
        if (!$href && !$disabled) {
            $page_offset = (($page_num - $current_page) * $limit) + $offset;
            if ($page_offset <= 0) {
                // don't include offset=0
                $page_offset = null;
            }
            
            $href = $get_href($page_offset);
        }
        
        if ($href && !$disabled) {
            $link = elgg_view_url($href, $text);
        } else {
            $link = elgg_format_element('span', [], $page['text']);
        }
        
        $element_options = [
            'class' => elgg_extract_class($page),
        ];
        if ($disabled) {
            $element_options['class'][] = 'elgg-state-disabled';
        }
            
        $list .= elgg_format_element('li', $element_options, $link);
    }
}

if (empty($list)) {
    return;
}

$pagination_class = elgg_extract_class($vars, ['elgg-pagination'], 'pagination_class');
$position = elgg_extract('position', $vars);
if (!empty($position)) {
    $pagination_class[] = "elgg-pagination-{$position}";
}

echo elgg_format_element('ul', ['class' => $pagination_class], $list);