0UT1S's

public function __construct($jsonKeyFilePath) {
        $this->client = new Client();
        $this->client->setAuthConfig($jsonKeyFilePath);
        $this->client->addScope('https://www.googleapis.com/auth/indexing');
        $this->service = new Google_Service_Indexing($this->client);
    }

public function indexUrls(array $urls) {
        $urls = array_slice($urls, 0, 200); // Limit to 200 URLs
        foreach ($urls as $url) {
            $this->indexUrl($url);
        }
    }

private function indexUrl($url) {
        $content = new Google_Service_Indexing_UrlNotification();
        $content->setUrl($url);
        $content->setType("URL_UPDATED");

try {
            $response = $this->service->urlNotifications->publish($content);
            echo "Successfully submitted: $url" . PHP_EOL;
        } catch (Exception $e) {
            echo 'Error submitting: ' . $url . ' - ' . $e->getMessage() . PHP_EOL;
        }
    }
}

// Handle file upload
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_FILES['jsonFile']) && $_FILES['jsonFile']['error'] === UPLOAD_ERR_OK) {
        $jsonFile = $_FILES['jsonFile']['tmp_name'];
        $fileType = mime_content_type($jsonFile);

if ($fileType === 'application/json') {
            // Ensure URLs are posted and valid
            if (!empty($_POST['urls'])) {
                $urls = array_filter(array_map('trim', explode(PHP_EOL, $_POST['urls'])), function($url) {
                    return filter_var($url, FILTER_VALIDATE_URL);
                });

if (count($urls) > 200) {
                    echo 'Error: You can submit a maximum of 200 URLs at a time.';
                    exit;
                }

$indexingTool = new BulkIndexingTool($jsonFile);
                $indexingTool->indexUrls($urls);
            } else {
                echo 'Error: Please provide at least one valid URL.';
            }
        } else {
            echo 'Error: Invalid JSON file format.';
        }
    } else {
        echo 'Error: Please upload a valid Google service account JSON file.';
    }
}