LDAP authentication by binding user credentials

function fetchData($username, $password)
    {
        $this->log('Auth_Container_LDAP::fetchData() called.', AUTH_LOG_DEBUG);
        $err = $this->_prepare();
        if ($err !== true) {
            return PEAR::raiseError($err->getMessage(), $err->getCode());
	}

        $err = $this->_getBaseDN();
        if ($err !== true) {
            return PEAR::raiseError($err->getMessage(), $err->getCode());
        }

        // UTF8 Encode username for LDAPv3
        if (@ldap_get_option($this->conn_id, LDAP_OPT_PROTOCOL_VERSION, $ver) && $ver == 3) {
            $this->log('UTF8 encoding username for LDAPv3', AUTH_LOG_DEBUG);
            $username = utf8_encode($username);
        }

 /*       // make search filter
        $filter = sprintf('(&(%s=%s)%s)',
                          $this->options['userattr'],
                          $this->_quoteFilterString($username),
                          $this->options['userfilter']);

        // make search base dn
        $search_basedn = $this->options['userdn'];
        if ($search_basedn != '' && substr($search_basedn, -1) != ',') {
            $search_basedn .= ',';
        }
        $search_basedn .= $this->options['basedn'];

        // attributes
        $searchAttributes = $this->options['attributes'];

        // make functions params array
        $func_params = array($this->conn_id, $search_basedn, $filter, $searchAttributes);

        // search function to use
        $func_name = $this->_scope2function($this->options['userscope']);

        $this->log("Searching with $func_name and filter $filter in $search_basedn", AUTH_LOG_DEBUG);

        // search
        if (($result_id = @call_user_func_array($func_name, $func_params)) === false) {
            $this->log('User not found', AUTH_LOG_DEBUG);
        } elseif (@ldap_count_entries($this->conn_id, $result_id) >= 1) { // did we get some possible results?

            $this->log('User(s) found', AUTH_LOG_DEBUG);

            $first = true;
            $entry_id = null;

            do {

                // then get the user dn
                if ($first) {
                    $entry_id = @ldap_first_entry($this->conn_id, $result_id);
                    $first = false;
                } else {
                    $entry_id = @ldap_next_entry($this->conn_id, $entry_id);
                    if ($entry_id === false)
                        break;
                }
                $user_dn  = @ldap_get_dn($this->conn_id, $entry_id);

                // as the dn is not fetched as an attribute, we save it anyway
                if (is_array($searchAttributes) && in_array('dn', $searchAttributes)) {
                    $this->log('Saving DN to AuthData', AUTH_LOG_DEBUG);
                    $this->_auth_obj->setAuthData('dn', $user_dn);
                }

                // fetch attributes
                if ($attributes = @ldap_get_attributes($this->conn_id, $entry_id)) {

                    if (is_array($attributes) && isset($attributes['count']) &&
                         $attributes['count'] > 0) {

                        // ldap_get_attributes() returns a specific multi dimensional array
                        // format containing all the attributes and where each array starts
                        // with a 'count' element providing the number of attributes in the
                        // entry, or the number of values for attribute. For compatibility
                        // reasons, it remains the default format returned by LDAP container
                        // setAuthData().
                        // The code below optionally returns attributes in another format,
                        // more compliant with other Auth containers, where each attribute
                        // element are directly set in the 'authData' list. This option is
                        // enabled by setting 'attrformat' to
                        // 'AUTH' in the 'options' array.
                        // eg. $this->options['attrformat'] = 'AUTH'

                        if ( strtoupper($this->options['attrformat']) == 'AUTH' ) {
                            $this->log('Saving attributes to Auth data in AUTH format', AUTH_LOG_DEBUG);
                            unset ($attributes['count']);
                            foreach ($attributes as $attributeName => $attributeValue ) {
                                if (is_int($attributeName)) continue;
                                if (is_array($attributeValue) && isset($attributeValue['count'])) {
                                    unset ($attributeValue['count']);
                                }
                                if (count($attributeValue)<=1) $attributeValue = $attributeValue[0];
                                $this->log('Storing additional field: '.$attributeName, AUTH_LOG_DEBUG);
                                $this->_auth_obj->setAuthData($attributeName, $attributeValue);
                            }
                        }
                        else
                        {
                            $this->log('Saving attributes to Auth data in LDAP format', AUTH_LOG_DEBUG);
                            $this->_auth_obj->setAuthData('attributes', $attributes);
                        }
                    }
                }
                @ldap_free_result($result_id);
	

                // need to catch an empty password as openldap seems to return TRUE
                // if anonymous binding is allowed
 */		$user_dn = $username;
		if ($password != "") {
                    $this->log("Bind as $user_dn", AUTH_LOG_DEBUG);

                    // try binding as this user with the supplied password
                    if (@ldap_bind($this->conn_id, $user_dn, $password)) {
                        $this->log('Bind successful', AUTH_LOG_DEBUG);
                        // check group if appropiate
                        if (strlen($this->options['group'])) {
                            // decide whether memberattr value is a dn or the username
                            $this->log('Checking group membership', AUTH_LOG_DEBUG);
                            $return = $this->checkGroup(($this->options['memberisdn']) ? $user_dn : $username);
                            $this->_disconnect();
                            return $return;
                        } else {
                            $this->log('Authenticated', AUTH_LOG_DEBUG);
                            $this->_disconnect();
                            return true; // user authenticated
                        } // checkGroup
                    } // bind
               } // non-empty password
 //           } while ($this->options['try_all'] == true); // interate through entries
 //       } // get results
        // default
        $this->log('NOT authenticated!', AUTH_LOG_DEBUG);
        $this->_disconnect();
        return false;
    }