<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\PrintTaskDefinition;
use Microsoft\Graph\Generated\Models\AppIdentity;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new PrintTaskDefinition();
$requestBody->setDisplayName('Test TaskDefinitionName');
$createdBy = new AppIdentity();
$createdBy->setDisplayName('Requesting App Display Name');
$requestBody->setCreatedBy($createdBy);
$result = $graphServiceClient->escapedPrint()->taskDefinitions()->byPrintTaskDefinitionId('printTaskDefinition-id')->patch($requestBody)->wait();