<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\TermStore\Term;
use Microsoft\Graph\Beta\Generated\Models\TermStore\LocalizedLabel;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new Term();
$labelsLocalizedLabel1 = new LocalizedLabel();
$labelsLocalizedLabel1->setName('changedLabel');
$labelsLocalizedLabel1->setLanguageTag('en-US');
$labelsLocalizedLabel1->setIsDefault(true);
$labelsArray []= $labelsLocalizedLabel1;
$requestBody->setLabels($labelsArray);
$result = $graphServiceClient->termStore()->sets()->bySetId('set-id')->terms()->byTermId('term-id')->patch($requestBody)->wait();