flatpress/fp-includes/smarty-4.3.1/docs/programmers/api-variables/variable-allow-php-templates.md

$allow_php_templates

By default the PHP template file resource is disabled. Setting $allow_php_templates to TRUE will enable PHP template files.

::: {.informalexample}

<?php
$smarty->allow_php_templates = true;
?>

:::

Note

The PHP template file resource is an undocumented deprecated feature.