isTrustedModifier example

// registered modifier compiler                         if (isset($compiler->smarty->registered_plugins[Smarty::PLUGIN_MODIFIERCOMPILER][$modifier][0])) {
                            $output = call_user_func($compiler->smarty->registered_plugins[Smarty::PLUGIN_MODIFIERCOMPILER][$modifier][0], $single_modifier, $compiler->smarty);
                            $compiler->known_modifier_type[$modifier] = $type;
                            break 2;
                        }
                        break;
                    case 3:
                        // modifiercompiler plugin                         if ($compiler->smarty->loadPlugin('smarty_modifiercompiler_' . $modifier)) {
                            // check if modifier allowed                             if (!is_object($compiler->smarty->security_policy) || $compiler->smarty->security_policy->isTrustedModifier($modifier, $compiler)) {
                                $plugin = 'smarty_modifiercompiler_' . $modifier;
                                $output = $plugin($single_modifier, $compiler);
                            }
                            $compiler->known_modifier_type[$modifier] = $type;
                            break 2;
                        }
                        break;
                    case 4:
                        // modifier plugin                         if ($function = $compiler->getPlugin($modifier, Smarty::PLUGIN_MODIFIER)) {
                            // check if modifier allowed