WordPress at a glance
filter is not described

comment_form_fields filter-hook . WP 4.4.0

Filters the comment form fields, including the textarea.

Usage

add_filter( 'comment_form_fields', 'filter_function_name_8018' );
function filter_function_name_8018( $comment_fields ){
	// filter...

	return $comment_fields;
}
$comment_fields(array)
The comment fields.

Changelog

Since 4.4.0 Introduced.

Where the hook is called

comment_form()
comment_form_fields
wp-includes/comment-template.php 2605
$comment_fields = apply_filters( 'comment_form_fields', $comment_fields );

Where in WP core the hook is used WordPress

Usage not found.