Remove subject field from comments

Question

Is it possible to remove the subject field on comment forms? I find it to be kind of useless and redundant, since the subject of the comment is usually the title of the article being read, at least for me anyway.

Answer 1

You can turn it off in the UI at admin/structure/types/manage/type-name with the "Allow comment title" checkbox:

Answer 2

There I have found some solutions to this question.

Option 1:

How to disable comment titles in Drupal 7. This is so easy and good tutorial to simply hide the subject(title) of comment through user interface.

Option 2:

You can also use the hook_preprocess_comment() in template.php file of your current active theme. This is really cool snippet, you can also some other options ie. comment-reply, comment-delete or comment-edit etc.

function bartik_preprocess_comment(&$vars) {
  $vars['submitted'] = $vars['created'] . ' — ' . $vars['author'];
  switch( $vars['node']->type ){
    case 'macine-name-of-node-type':
      $vars['title'] =FALSE;
    break;
  }
}

Answer 3

//get comment by node id
$comment->nid = $nid;
//get form by form name
$form = drupal_get_form('comment_form', $comment); 
//hide subject in form
hide($form['subject']);
//check comment form
print render($form);