Update PDF Forms in PHP SDK

<?php
require_once 'vendor/autoload.php';

use Aspose\PDF\Api\PdfApi;
use Aspose\PDF\Model\Field;
use Aspose\PDF\Model\Fields;
use Aspose\PDF\Model\FieldType;

function updateFormField() {
    $LOCAL_FILE_NAME = "C:\\Samples\\sample.pdf";
    $STORAGE_FILE_NAME = "sample.pdf";
    $RESULT_FILE_NAME = "output_sample.pdf";
    $FIELD_NAME      = "Signature_1";
    
    // Load credentials from JSON file
    $credentials = json_decode(file_get_contents('credentials.json'), true);
    
    $pdfApi = new PdfApi($credentials['id'], $credentials['key']);
    
    try {
        // Load Pdf file
        $fileData = file_get_contents($LOCAL_FILE_NAME);
        $uploadResult = $pdfApi->uploadFile($STORAGE_FILE_NAME, $fileData);
        echo $uploadResult->getResponseText() . PHP_EOL;
    } catch (Exception $e) {
        echo 'Error uploading file: ' . $e->getMessage() . PHP_EOL;
    }
    
    // Create Text form field object
    $field = new Field();
    $field->setName("EMail");
    $field->setType(FieldType::TEXT);
    $field->setValues(['aspose-pdf-cloud@example.com']);

    // Create Form Fileds object
    $fields = new Fields();
    $fields->setList([$field]);

    try {
        // Update Form fields for PDF in storage
        $response = $pdfApi->putUpdateFields($STORAGE_FILE_NAME, $fields);
        echo $response->getStatus() . PHP_EOL;
        
        // Download changed PDF file
        $downloadRes = $pdfApi->downloadFile($STORAGE_FILE_NAME);
        file_put_contents($RESULT_FILE_NAME, $downloadRes->getContents());
    } catch (Exception $e) {
        echo 'Error processing PDF: ' . $e->getMessage() . PHP_EOL;
    }
}

updateFormField();