comments_block.php

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<?php
$options = array(
    'type' => 'object',
    'subtype' => 'comment',
    'limit' => elgg_extract('limit', $vars, 4),
    'wheres' => array(),
    'preload_owners' => true,
    'distinct' => false,
);

$owner_guid = elgg_extract('owner_guid', $vars);
$container_guid = elgg_extract('container_guid', $vars);
$subtypes = elgg_extract('subtypes', $vars);

if ($owner_guid || $container_guid || $subtypes) {
    $db_prefix = elgg_get_config('dbprefix');

    // Join on the entities table to check container subtype and/or owner
    $options['joins'] = array("JOIN {$db_prefix}entities ce ON e.container_guid = ce.guid");
}

// If owner is defined, view only the comments that have
// been posted on objects owned by that user
if ($owner_guid) {
    $options['wheres'][] = "ce.owner_guid = $owner_guid";
}

// If container is defined, view only the comments that have
// been posted on objects placed inside that container
if ($container_guid) {
    $options['wheres'][] = "ce.container_guid = $container_guid";
}

// If subtypes are defined, view only the comments that have been
// posted on objects that belong to any of those subtypes
if ($subtypes) {
    if (is_array($subtypes)) {
        $subtype_ids = array();
        foreach ($subtypes as $subtype) {
            $id = (int)get_subtype_id('object', $subtype);
            if ($id) {
                $subtype_ids[] = $id;
            }
        }
        if ($subtype_ids) {
            $subtype_string = implode(',', $subtype_ids);
            $options['wheres'][] = "ce.subtype IN ($subtype_string)";
        } else {
            // subtype ids do not exist so cannot display comments
            $options['wheres'][] = "1 = -1";
        }
    } else {
        $subtype_id = (int)get_subtype_id('object', $subtypes);
        $options['wheres'][] = "ce.subtype = $subtype_id";
    }
}

$title = elgg_echo('generic_comments:latest');
$comments = elgg_get_entities($options);
if ($comments) {
    $body = elgg_view('page/components/list', array(
        'items' => $comments,
        'pagination' => false,
        'list_class' => 'elgg-latest-comments',
        'full_view' => false,
    ));
} else {
    $body = '<p>' . elgg_echo('generic_comment:none') . '</p>';
}

echo elgg_view_module('aside', $title, $body);