<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Users\UsersRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new UsersRequestBuilderGetRequestConfiguration();
$queryParameters = UsersRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->select = ["displayName","id"];
$queryParameters->filter = "identities/any(c:c/issuerAssignedId eq 'j.smith@yahoo.com' and c/issuer eq 'My B2C tenant')";
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->users()->get($requestConfiguration)->wait();