wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php:1889If empty comments are not allowed, checks if the provided comment content is not empty.
$prepared_commentarrayboolOne hook fires while WP_REST_Comments_Controller::check_is_comment_content_allowed() runs, in this order:
Filters whether an empty comment should be allowed.
protected function check_is_comment_content_allowed( $prepared_comment ) { $check = wp_parse_args( $prepared_comment, array( 'comment_post_ID' => 0, 'comment_author' => null, 'comment_author_email' => null, 'comment_author_url' => null, 'comment_parent' => 0, 'user_id' => 0, ) ); /** This filter is documented in wp-includes/comment.php */ $allow_empty = apply_filters( 'allow_empty_comment', false, $check ); if ( $allow_empty ) { return true; } /* * Do not allow a comment to be created with missing or empty * comment_content. See wp_handle_comment_submission(). */ return '' !== $check['comment_content']; }Introduced in 5.6.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.