This tag outputs a complete commenting form for use within a template.
Most strings and form fields may be controlled through the
$args array passed into the function, while you may also choose to use the
comment_form_default_fields filter to modify the array of default fields if you'd just like to add a new one or remove a single field. All fields are also individually passed through a filter of the form
$name is the key used in the array of fields.
comment_form( $args, $post_id );