edit.php

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<?php

$guid = elgg_extract('guid', $vars);

elgg_gatekeeper();

if (!$guid) {
    register_error(elgg_echo('generic_comment:notfound'));
    forward(REFERER);
}
$comment = get_entity($guid);
if (!($comment instanceof \ElggComment) || !$comment->canEdit()) {
    register_error(elgg_echo('generic_comment:notfound'));
    forward(REFERER);
}

$target = $comment->getContainerEntity();
if (!($target instanceof \ElggEntity)) {
    register_error(elgg_echo('generic_comment:notfound'));
    forward(REFERER);
}

$title = elgg_echo('generic_comments:edit');
elgg_push_breadcrumb($target->getDisplayName(), $target->getURL());
elgg_push_breadcrumb($title);

$params = array(
    'entity' => $target,
    'comment' => $comment,
);
$content = elgg_view_form('comment/save', null, $params);

$params = array(
    'content' => $content,
    'title' => $title,
    'filter' => '',
);
$body = elgg_view_layout('content', $params);
echo elgg_view_page($title, $body);