PHP-EWS: Set IsRead Flag for a Message - php

Question

I am writing a php script to read emails from an Exchange Server 2010. Currently, I am able to retrieve all unread emails, but I would like to mark the emails that I have retrieved as read, so I don't retrieve messages I have already retrieved again. I am using php-ews from github. I created a script to do this, but every time it runs I get this error when I call UpdateItem.
PHP Fatal error: SOAP-ERROR: Encoding: object has no 'Path' property
Stack Trace:
#0 ExchangeClient.php(355): SoapClient->__call('UpdateItem', Array)
#1 ExchangeClient.php(355): NTLMSoapClient->UpdateItem(Object(UpdateItemType))
#2 markReadTest.php(20): ExchangeClient->mark_as_read(Object(stdClass))
#3 ExchangeClient.php on line 355
I'm note sure what is causing this error because I think all of my SOAP nesting is correct because I have been referring to Microsoft's EWS SOAP reference for the UpdateItem function. Here is the code for the script that I am using to mark messages as read.
public function mark_as_read($ReadMessage)
{
$request = new EWSType_UpdateItemType();
$request->MessageDisposition = 'SaveOnly';
$request->ConflictResolution = 'AlwaysOverwrite';
$request->ItemChanges = array();
$change = new EWSType_ItemChangeType();
$change->ItemId = new EWSType_ItemIdType();
$change->ItemId->Id = $ReadMessage->ItemId->Id;
$change->ItemId->ChangeKey = $ReadMessage->ItemId->ChangeKey;
$field = new EWSType_SetItemFieldType();
$field->FieldURI = new EWSType_PathToUnindexedFieldType();
$field->FieldURI->FieldURI = 'message:IsRead';
$field->Message = new EWSType_MessageType();
$field->Message->IsRead = True;
$change->Updates->SetItemField[] = $field;
$request->ItemChanges[] = $change;
$response = $this->client->UpdateItem($request);
return $response;
}

Answer 1

After some research I found a comment that provided the solution on a howtoforge post about connecting to EWS through the PHP SOAPclient. The solution was to replace the path element with FieldURI elements in the types.xsd file.
Original XML Tag:
<xs:element ref="t:Path"/>
Replaced By:
<xs:element ref="t:FieldURI"/>
<xs:element ref="t:IndexedFieldURI"/>
<xs:element ref="t:ExtendedFieldURI"/>
This path element occurred 8 times in my version of types.xsd which I got from an Exchange-2013 SP1 server and I replaced all instances of it with the FieldURI elements. After, I did this I was able to mark emails as read without modifying the code I used in my question

Answer 2

Two things that maybe doing it first you should be setting the IsReadSpecified property to true eg
$request = new EWSType_UpdateItemType();
$request->MessageDisposition = 'SaveOnly';
$request->ConflictResolution = 'AlwaysOverwrite';
$request->ItemChanges = array();
$change = new EWSType_ItemChangeType();
$change->ItemId = new EWSType_ItemIdType();
$change->ItemId->Id = $ReadMessage->ItemId->Id;
$change->ItemId->ChangeKey = $ReadMessage->ItemId->ChangeKey;
$field = new EWSType_SetItemFieldType();
$field->FieldURI = new EWSType_PathToUnindexedFieldType();
$field->FieldURI->FieldURI = 'message:IsRead';
$field->Message = new EWSType_MessageType();
$field->Message->IsReadSpecified = true;
$field->Message->IsRead = true;
$change->Updates->SetItemField[] = $field;
$request->ItemChanges[] = $change;
$response = $this->client->UpdateItem($request);
return $response;
Also you might want to look at what the request SOAP is your code is submitting to the server and post that. Its generally a lot clearer from the SOAP what you are doing incorrectly.