This PHP code connects to an LDAP server, performs a search for entries with the last name and then sorts and prints them alphabetically. The sorting is done by a custom function called compareEntry, which compares entries based on last names and first names. It uses the LDAP functions to communicate with the server and showcases basic error handling.

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The code demonstrates the use of arrays, loops, sorting, and LDAP functions, making it a good example for understanding how to interact with LDAP servers in PHP.