save.php

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<?php
use Elgg\Values;
 
$entity_guid = (int) get_input('entity_guid', 0, false);
$comment_guid = (int) get_input('comment_guid', 0, false);
$comment_text = get_input('generic_comment');
 
if (empty($comment_text)) {
    return elgg_error_response(elgg_echo('generic_comment:blank'));
}
 
if ($comment_guid) {
    // Edit an existing comment
    $comment = get_entity($comment_guid);
    if (!$comment instanceof \ElggComment) {
        return elgg_error_response(elgg_echo('generic_comment:notfound'));
    }
    
    if (!$comment->canEdit()) {
        return elgg_error_response(elgg_echo('actionunauthorized'));
    }
 
    $comment->description = $comment_text;
    if (!$comment->save()) {
        return elgg_error_response(elgg_echo('generic_comment:failure'));
    }
    
    $entity = $comment->getContainerEntity();
    $success_message = elgg_echo('generic_comment:updated');
} else {
    // Create a new comment on the target entity
    $entity = get_entity($entity_guid);
    if (!$entity instanceof \ElggEntity) {
        return elgg_error_response(elgg_echo('generic_comment:notfound'));
    }
    
    if (!$entity->canComment()) {
        return elgg_error_response(elgg_echo('actionunauthorized'));
    }
 
    $comment = new \ElggComment();
    $comment->description = $comment_text;
    
    if ($entity instanceof \ElggComment) {
        $comment->level = $entity->getLevel() + 1;
        $comment->parent_guid = $entity->guid;
        $comment->thread_guid = $entity->getThreadGUID();
        
        // make sure comment is contained in the content
        $entity = $entity->getContainerEntity();
    }
 
    $comment->container_guid = $entity->guid;
    $comment->access_id = $entity->access_id;
        
    if (!$comment->save()) {
        return elgg_error_response(elgg_echo('generic_comment:failure'));
    }
 
    // only river for top level comments
    if ($comment->getLevel() === 1) {
        // Add to river
        elgg_create_river_item([
            'view' => 'river/object/comment/create',
            'action_type' => 'comment',
            'object_guid' => $comment->guid,
            'target_guid' => $entity->guid,
        ]);
    }
    
    $success_message = elgg_echo('generic_comment:posted');
}
 
$comment_count = $entity->countComments();
 
$result = [
    'guid' => $comment->guid,
    'output' => elgg_view_entity($comment),
    'container_guid' => $entity->guid,
    'container_comment_count' => $comment_count,
    'container_comment_badge_text' => $comment_count ? Values::shortFormatOutput($comment_count, 1) : null,
];
 
return elgg_ok_response($result, $success_message, $comment->getURL());