original_string: public function thumbnail($size = 'full')
      {
          $thumb = wp_get_attachment_image_src(get_post_thumbnail_id($this->id()), $size);
          return isset($thumb[0]) ? $thumb[0] : '';
      }
code: public function thumbnail($size = 'full')
      {
          $thumb = wp_get_attachment_image_src(get_post_thumbnail_id($this->id()), $size);
          return isset($thumb[0]) ? $thumb[0] : '';
      }
code_tokens: public function thumbnail ( $ size = 'full' ) { $ thumb = wp_get_attachment_image_src ( get_post_thumbnail_id ( $ this -> id ( ) ) , $ size ) ; return isset ( $ thumb [ 0 ] ) ? $ thumb [ 0 ] : '' ; }
docstring: Retrieve the post's thumbnail
  
  @access public
  @global object $post
  @param string $size (default: "full")
  @return string
docstring_tokens: Retrieve the post s thumbnail