This is an array of all local files and directories that are considered secure. {include} and {fetch} use this when $security is enabled.
Example 12-5. $secure_dir example
<?php$secure_dirs[] = '/path/to/site/root/templates/';$secure_dirs[] = '/path/to/includes/';$smarty->secure_dir = $secure_dirs;?>
See also $security_settings and $trusted_dir.