createRequest returns array instead of class - microsoft-graph-api

Question

I am trying to retrieve information on users using the Microsoft Graph Library for PHP.
But this code runs into the error Trying to get property 'getGivenName' of non-object.
$user = $graph->createRequest("GET", "/users")
->setReturnType(Model\User::class)
->execute();
This is due to the fact, that $user is an array instead of an object!? What is wrong with the SDK (or my code)?
Is there any better documentation for the SDK???

Answer 1

This is due to the fact, that $user is an array instead of an object!?
That's right, since the endpoint GET Users returns the list of users, in the provided example:
$users = $graph->createRequest("GET", "/users")
->setReturnType(\Microsoft\Graph\Model\User::class)
->execute();
$users contains an array of objects of Microsoft\Graph\Model\User type, and
$givenName = $users[0]->getGivenName();
gives GivenName property of first item in array.
A specific user could be requested via GET /users/{id | userPrincipalName} endpoint:
$user = $graph->createRequest("GET", "/users/{$userId}")
->setReturnType(\Microsoft\Graph\Model\User::class)
->execute();
In that case $user object is of Microsoft\Graph\Model\User type:
$givenName = $user->getGivenName();
Update
setReturnType function accept Microsoft Graph API entity type name, in your example it appears Model\User points to type which doesn't belong to Microsoft\Graph\Model namespace and as a result JSON response is not getting deserialized into class instance.
Instead of
setReturnType(Model\User::class)
try to specify fully qualified class name:
setReturnType(\Microsoft\Graph\Model\User::class)