Hi Kun, Depending on what you're aiming for, you could take a look at UO's approach that supports our Primo stack maps application: https://github.com/uoregon-libraries/library-bookshelves (under the Parse Strategy section of the README) --Ray Ray Henry Supervisor, Library Applications Programming University of Oregon Libraries Knight Library 121H 541.346.1812 -----Original Message----- From: Code for Libraries <[log in to unmask]> On Behalf Of Kun Lin Sent: Thursday, December 5, 2019 4:13 PM To: [log in to unmask] Subject: [CODE4LIB] compare LC call number Is there any good existing scripts of comparing LC call numbers to determine which one should come first? Javascript or PHP. Thanks a lot ---- Kun Lin Systems and Application Librarian Whitman College PGP Public Key https://urldefense.com/v3/__https://kj7ieg.com/dnwklin_public.txt__;!!C5qS4YX3!Q2vyYxTHyvUaGQCbZV5Kfwqk9iRTo7SS0exgLARIT9nGdzlGbQenk3Q0Wa0NboU$