<?php
use Microsoft\Graph\Beta\GraphServiceClient;
use Microsoft\Graph\Beta\Generated\Models\CertificateBasedApplicationConfiguration;
$graphServiceClient = new GraphServiceClient($tokenRequestContext, $scopes);
$requestBody = new CertificateBasedApplicationConfiguration();
$requestBody->setOdataType('#microsoft.graph.certificateBasedApplicationConfiguration');
$requestBody->setDisplayName('New display name');
$requestBody->setDescription('New description text');
$result = $graphServiceClient->directory()->certificateAuthorities()->certificateBasedApplicationConfigurations()->byCertificateBasedApplicationConfigurationId('certificateBasedApplicationConfiguration-id')->patch($requestBody)->wait();