require_once('smarty/libs/Smarty.class.php'); $smarty = new Smarty; $smarty->config_load('config.conf', 'main'); $config_vars = $smarty->get_config_vars('my_var'); echo $config_vars['my_var'];In this example, we first load the Smarty library and create a new Smarty object. We then use the config_load function to load the "config.conf" file and specify the "main" section. Finally, we use the get_config_vars function to retrieve the value of the "my_var" configuration variable and store it in the $config_vars variable. We then print out the value of the "my_var" variable. Based on the use of the Smarty library and the use of specific Smarty functions, it can be determined that the package library being used is Smarty Templating Engine.