<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\ServicePrincipals\ServicePrincipalsRequestBuilderGetRequestConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestConfiguration = new ServicePrincipalsRequestBuilderGetRequestConfiguration();
$headers = [
'ConsistencyLevel' => 'eventual',
];
$requestConfiguration->headers = $headers;
$queryParameters = ServicePrincipalsRequestBuilderGetRequestConfiguration::createQueryParameters();
$queryParameters->filter = "startswith(displayName, 'a')";
$queryParameters->count = true;
$queryParameters->top = 1;
$queryParameters->orderby = ["displayName"];
$requestConfiguration->queryParameters = $queryParameters;
$result = $graphServiceClient->servicePrincipals()->get($requestConfiguration)->wait();