This tells smarty to respect the include_path within the File Template Resource handler and the plugin loader to resolve the directories known to $template_dir. The flag also makes the plugin loader check the include_path for $plugins_dir.


You should not design your applications to rely on the include_path, as this may - depending on your implementation - slow down your system (and Smarty) considerably.

If use_include_path is enabled, file discovery for $template_dir and $plugins_dir work as follows.

This means that whenever a directory/file relative to the current working directory is encountered, it is preferred over anything potentially accessible through the include_path.


Smarty does not filter elements of the include_path. That means a ".:" within your include path will trigger the current working directory lookup twice.

See also Template Resources and $template_dir