save.php

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<?php
$entity_guid = (int) get_input('entity_guid', 0, false);
$comment_guid = (int) get_input('comment_guid', 0, false);
$comment_text = get_input('generic_comment');
$is_edit_page = (bool) get_input('is_edit_page', false, false);

if (empty($comment_text)) {
    register_error(elgg_echo("generic_comment:blank"));
    forward(REFERER);
}

if ($comment_guid) {
    // Edit an existing comment
    $comment = get_entity($comment_guid);

    if (!elgg_instanceof($comment, 'object', 'comment')) {
        register_error(elgg_echo("generic_comment:notfound"));
        forward(REFERER);
    }
    if (!$comment->canEdit()) {
        register_error(elgg_echo("actionunauthorized"));
        forward(REFERER);
    }

    $comment->description = $comment_text;
    if ($comment->save()) {
        system_message(elgg_echo('generic_comment:updated'));
    } else {
        register_error(elgg_echo('generic_comment:failure'));
    }
} else {
    // Create a new comment on the target entity
    $entity = get_entity($entity_guid);
    if (!$entity) {
        register_error(elgg_echo("generic_comment:notfound"));
        forward(REFERER);
    }

    $user = elgg_get_logged_in_user_entity();

    $comment = new ElggComment();
    $comment->description = $comment_text;
    $comment->owner_guid = $user->getGUID();
    $comment->container_guid = $entity->getGUID();
    $comment->access_id = $entity->access_id;
    $guid = $comment->save();

    if (!$guid) {
        register_error(elgg_echo("generic_comment:failure"));
        forward(REFERER);
    }

    // Notify if poster wasn't owner
    if ($entity->owner_guid != $user->guid) {
        $owner = $entity->getOwnerEntity();

        notify_user($owner->guid,
            $user->guid,
            elgg_echo('generic_comment:email:subject', array(), $owner->language),
            elgg_echo('generic_comment:email:body', array(
                $entity->title,
                $user->name,
                $comment_text,
                $entity->getURL(),
                $user->name,
                $user->getURL()
            ), $owner->language),
            array(
                'object' => $comment,
                'action' => 'create',
            )
        );
    }

    // Add to river
    elgg_create_river_item(array(
        'view' => 'river/object/comment/create',
        'action_type' => 'comment',
        'subject_guid' => $user->guid,
        'object_guid' => $guid,
        'target_guid' => $entity_guid,
    ));

    system_message(elgg_echo('generic_comment:posted'));
}

if ($is_edit_page) {
    forward($comment->getURL());
}

forward(REFERER);