function dwqa_columns_head($defaults)
{
    if (isset($_GET['post_type']) && $_GET['post_type'] == 'dwqa-answer') {
        $defaults = array('cb' => '<input type="checkbox">', 'info' => __('Answer', 'dwqa'), 'author' => __('Author', 'dwqa'), 'comment' => '<span><span class="vers"><div title="Comments" class="comment-grey-bubble"></div></span></span>', 'dwqa-question' => __('In Response To', 'dwqa'));
    }
    if ($_GET['post_type'] == 'dwqa-question') {
        $defaults['info'] = __('Info', 'dwqa');
        $defaults = dwqa_array_insert($defaults, array('question-category' => 'Category', 'question-tag' => 'Tags'), 1);
    }
    return $defaults;
}
 public function columns_head($defaults)
 {
     if (isset($_GET['post_type']) && esc_html($_GET['post_type']) == $this->get_slug()) {
         $defaults['info'] = __('Info', 'dwqa');
         $defaults = dwqa_array_insert($defaults, array('question-category' => 'Category', 'question-tag' => 'Tags'), 1);
     }
     return $defaults;
 }