Phpecshoplib_insert.php usage problems

I added a functioninsert_cart_goods () method to includeslib_insert.php. the content is as follows: $ cart_infoget_info (), which is used to obtain information about the shopping cart in the database $ GLOBALS [& #39; smarty & #39; -& gt; assign (& #39; info & #39;, $ cart_info); $ info $ GLOBALS [& #39; smarty & #39;]-& gt; fetch (& #39; libraryinfo. lbi & #39;); ecshopphpsmarty

I have added a function insert_cart_goods () method in includes/lib_insert.php. the content is as follows:
$ Cart_info = get_info () // obtain the information of the shopping cart in the database.
$ GLOBALS ['smarty ']-> assign ('info', $ cart_info );
$ Info = $ GLOBALS ['smarty ']-> fetch ('Library/info. lbi ');
Return $ info;

However, after saving and running, the entire page cannot be displayed. for help!