[Samba] ldap_modify change password

[Shem Pasamba]

Hello,

I would like to change samba4 AD user's password using php.  Here's my code:

function UpdateLdapPassword($username, $newpassword)
{
                 global $ds;
                 global $rdn;


$entry["clearTextPassword"][0]=base64_encode(iconv('UTF-8','UTF-16LE',$newpassword));

                 $bReturn= ldap_modify ($ds, $rdn, $entry);

                 Debug ("msg:'".ldap_error($ds)."'<br><br>");

                 return $bReturn;
}

The logs display something like this:

[2014/02/17 15:38:04.542674, 10, pid=29998, effective(0, 0), real(0, 0), 
class=ldb] ../lib/ldb-samba/ldb_wrap.c:71(ldb_wrap_debug)
   ldb: start ldb transaction error: (null)
[2014/02/17 15:38:04.542810, 10, pid=29998, effective(0, 0), real(0, 0), 
class=ldb] ../lib/ldb-samba/ldb_wrap.c:71(ldb_wrap_debug)
   ldb: ldb_trace_request: MODIFY
   dn: CN=test1,OU=aiiasusers,DC=aiias,DC=edu
   changetype: modify
   replace: clearTextPassword
   clearTextPassword: SABhAHAAcAB5ADIAMAAxADQA
   -


    control: 1.3.6.1.4.1.7165.4.3.17  crit:0  data:no

But when I try to login to test1 using winbind in another machine it 
says Wrong password.  Is there anything wrong that I'm doing? Thanks for 
your help.

Shem G. Pasamba