php ldap添加与修改

/**
 * ldap 备份
 * @param int $cardid
 * @param string $username
 * @param string $password 未加密密码
 * @return null
 */
function ldapBack($cardid,$username,$password){
    $connect = ldap_connect(LDAP_HOST,LDAP_PORT);
    if(!$connect){
        $log = Logger::getLogger();
        $log->fatal('备份LDAP连接失败！');
    }
    ldap_set_option($connect, LDAP_OPT_PROTOCOL_VERSION, 3);
    @$back_bind = ldap_bind($connect, LDAP_ADMIN_USER, LDAP_ADMIN_PW); 

    $add_entry = array();
    $add_entry['objectclass'][] = 'top';
    $add_entry['objectclass'][] = 'person';
    $add_entry['objectclass'][] = 'inetOrgPerson';
    $add_entry['cn'] = $username;
    $add_entry['uid'] = $cardid;
    $add_entry['sn'] = $username;
    $add_entry['userpassword'] = "{MD5}".base64_encode(md5($password,true));
    $dn = "uid={$cardid},ou=people,dc=buct,dc=edu,dc=cn";

    //查询ldap中是否已经存在相应数据
    $base_dn = "DC=buct,DC=edu,DC=cn";
    $filter = "(uid=$cardid)";
    $read = ldap_search($connect, $base_dn, $filter);
    $info = ldap_get_entries($connect, $read);

    if(empty($info['count']))
    {//不存在数据，使用添加方法添加数据
        $boo = ldap_add($connect,$dn,$add_entry);
    }else
    {//数据已经存在，使用编辑方法修改数据
        $boo = ldap_modify($connect,$dn,$add_entry);
    }
    //$boo = ldap_modify($connect,$dn,$add_entry);

    ldap_close($connect);
    $_data = array();
    $_data['cardid'] = $info[0]['uid'][0];
    $_data['name'] = $info[0]['sn'][0];
    return $_data;
}