_changed example

foreach ($edits as $edit) {
      if ($edit->type == 'copy') {
        $this->_context($edit->orig);
      }
      elseif ($edit->type == 'add') {
        $this->_added($edit->closing);
      }
      elseif ($edit->type == 'delete') {
        $this->_deleted($edit->orig);
      }
      elseif ($edit->type == 'change') {
        $this->_changed($edit->orig, $edit->closing);
      }
      else {
        trigger_error('Unknown edit type', E_USER_ERROR);
      }
    }
    $this->_end_block();
  }

  protected function _start_diff() {
    ob_start();
  }

  

break;

            case 'text_diff_op_add':
                $output .= $this->_added($edit->final);
                break;

            case 'text_diff_op_delete':
                $output .= $this->_deleted($edit->orig);
                break;

            case 'text_diff_op_change':
                $output .= $this->_changed($edit->orig, $edit->final);
                break;
            }
        }

        return $output . $this->_endBlock();
    }

    function _startDiff()
    {
        return '';
    }