Returns entry identifier for the next entry in the
result whose entries are being read starting with
ldap_first_entry(). If there are no more entries in
the result then it returns
FALSE.
ldap_next_entry() function is
used to retrieve the entries stored in the result. Successive
calls to the ldap_next_entry() return
entries one by one till there are no more entries. The first
call to ldap_next_entry() is made
after the call to ldap_first_entry() with the result_entry_identifier as
returned from the ldap_first_entry().
See also ldap_get_entries()