php - php-ews とメール ID

Question

私は、php-ews を使用して Exchange サーバーに接続する php スクリプトに取り組んでいます。手始めに、受信トレイにあるすべてのメールを取り出し、チェーンメールがどのように機能するかを調べました。簡単にするために、メール チェーンをグループ化できるようにしたいと考えています。私が見つけたのは、完全に無関係な 2 つのメールで、まったく同じ ID を持っています。ChangeKey は一意のように見えますが、チェーン メールには一意の changekey があるため、それに基づいてそれらをグループ化することはできません。「チェーンメール」の一意の ID を取得する方法についてのアイデアはありますか?

以下は、「すぐに使える」スクリプトです。

<?php
set_time_limit(120); 
require_once('autoload.php');
require_once('credentials.php');

//$ews = new ExchangeWebServices("hostname", "username", "password", ExchangeWebServices::VERSION_2010);
$ews = new ExchangeWebServices($host, $username, $password);

$request = new EWSType_FindItemType();
$request->ItemShape = new EWSType_ItemResponseShapeType();
$request->ItemShape->BaseShape = EWSType_DefaultShapeNamesType::DEFAULT_PROPERTIES;

$request->Traversal = EWSType_ItemQueryTraversalType::SHALLOW;

// Limits the number of items retrieved
$request->IndexedPageItemView = new EWSType_IndexedPageViewType();
$request->IndexedPageItemView->BasePoint = "Beginning";
$request->IndexedPageItemView->Offset = 0; // Item number you want to start at
$request->IndexedPageItemView->MaxEntriesReturned = 1000; // Numer of items to return in total

$request->ParentFolderIds = new EWSType_NonEmptyArrayOfBaseFolderIdsType();
$request->ParentFolderIds->DistinguishedFolderId = new EWSType_DistinguishedFolderIdType();
$request->ParentFolderIds->DistinguishedFolderId->Id = EWSType_DistinguishedFolderIdNameType::INBOX;

// sort order
$request->SortOrder = new EWSType_NonEmptyArrayOfFieldOrdersType();
$request->SortOrder->FieldOrder = array();
$order = new EWSType_FieldOrderType();

// sorts mails so that oldest appear first
// more field uri definitions can be found from types.xsd (look for UnindexedFieldURIType)
$order->FieldURI = '';
@$order->FieldURI->FieldURI = 'item:DateTimeReceived'; // @ symbol stops the creating default object from empty value error
$order->Order = 'Ascending'; 
$request->SortOrder->FieldOrder[] = $order;

$response = $ews->FindItem($request);

//For Debugging
//die("<pre>" . print_r($response, 1) . "</pre>");

if(!isset($response->ResponseMessages->FindItemResponseMessage->RootFolder))
{
    $responseMessage = $response->ResponseMessages->FindItemResponseMessage;
    die("<h3 style='text-align: center;'>Email</h3>" . $responseMessage->MessageText . "<br /><br />" . $responseMessage->ResponseCode);
}
else
    $totalItems = $response->ResponseMessages->FindItemResponseMessage->RootFolder->TotalItemsInView;

$emails = array();

$rootFolder = $response->ResponseMessages->FindItemResponseMessage->RootFolder;
$messages = $rootFolder->Items->Message;
$lastItemInRange = $rootFolder->IncludesLastItemInRange;
$i = 1; // Counter to multply the max etries retrurned, to create the offset value

while($lastItemInRange != 1) // While the last item in the inbox is strill not in range retrieve the next 1000 messages
{
    $limit = $request->IndexedPageItemView->MaxEntriesReturned;
    $request->IndexedPageItemView->Offset = $limit * $i;

    $response = $ews->FindItem($request);

    $rootFolder = $response->ResponseMessages->FindItemResponseMessage->RootFolder;
    $messages = array_merge($messages, $rootFolder->Items->Message);
    $lastItemInRange = $rootFolder->IncludesLastItemInRange;
    echo '<pre>';
    print_r( $messages);
    echo '</pre>';
    $i++;
}

?>

以下は、返される電子メールの例です。

[100] => stdClass Object
        (
            [ItemId] => stdClass Object
                (
                    [Id] => XXXXXXXXXXXXXXXXX
                    [ChangeKey] => XXXXXXXXXXXXXXXXXXXX
                )

            [Subject] => Test Email
            [Sensitivity] => Normal
            [Size] => 30200
            [DateTimeSent] => 2016-02-01T21:43:06Z
            [DateTimeCreated] => 2016-02-01T21:43:09Z
            [HasAttachments] => 
            [From] => stdClass Object
                (
                    [Mailbox] => stdClass Object
                        (
                            [Name] => Test User
                            [EmailAddress] => Test@Test.com
                            [RoutingType] => SMTP
                        )

                )

            [IsRead] => 1
        )