<?php
use Microsoft\Graph\GraphServiceClient;
use Microsoft\Graph\Generated\Models\PrintTaskTrigger;
use Microsoft\Graph\Generated\Models\PrintEvent;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new PrintTaskTrigger();
$requestBody->setEvent(new PrintEvent('jobStarted'));
$additionalData = [
'definition@odata.bind' => 'https://graph.microsoft.com/v1.0/print/taskDefinitions/{taskDefinitionId}',
];
$requestBody->setAdditionalData($additionalData);
$result = $graphServiceClient->escapedPrint()->printers()->byPrinterId('printer-id')->taskTriggers()->post($requestBody)->wait();