protected function generate_op_print_var($details, &$body)
{
$expr = $details['expr'];
$this->check_expr($expr);
if (!$this->is_safe($expr) && self::$autoescape) {
$args = array($expr);
$expr = $this->do_filtering('escape', $args);
}
$this->do_print($body, $expr);
}