StackDriver reporting for PHP CodeIgniter

MY_Exceptions.php

<?php

use Google\Cloud\ErrorReporting\Bootstrap;
use Google\Cloud\Logging\LoggingClient;
use Google\Cloud\Core\Report\SimpleMetadataProvider;

// application/core/MY_Exceptions.php
class MY_Exceptions extends CI_Exceptions {

    public function __construct()
    {
        parent::__construct();

        // set up StackDriver exception handling
        // https://github.com/GoogleCloudPlatform/php-docs-samples/blob/83cbbeb2ee36a458db4d2dc868cd8e16812fa957/error_reporting/quickstart.php
        // TODO not in development
        $projectId = getenv('GCLOUD_PROJECT') ?: 'YOUR_PROJECT_ID';
        $service = getenv('GAE_SERVICE') ?: 'testservice';
        $version = getenv('GAE_VERSION') ?: 'test';
        $logging = new LoggingClient([
            'projectId' => $projectId,
        ]);
        $metadata = new SimpleMetadataProvider([], $projectId, $service, $version);
        $psrLogger = $logging->psrLogger('error-log', [
            'metadataProvider' => $metadata,
        ]);
        Bootstrap::init($psrLogger);
    }

    public function show_exception($exception)
    {
      Bootstrap::exceptionHandler($exception);
      parent::show_exception($exception);
    }

    public function show_php_error($severity, $message, $filepath, $line)
    {
      Bootstrap::errorHandler($severity, $message, $filepath, $line);
      parent::show_php_error($severity, $message, $filepath, $line);
    }

?>