照片未使用php上传到s3 bucket

我正在尝试通过ec2实例将图像上传到s3 bucket。但是这些图像没有上传到s3。我可以验证它们是否被上传到ec2实例。上传到s3时出现一些问题。我意识到上传功能不起作用，但我不确定。两天以来我一直在努力解决这个问题。任何帮助都将不胜感激

EC2实例是一台linux机器。它安装了cURL和PHP cURL。图像将保存在“上载”文件夹中。AmazonSDK是通过解压安装的

<?php
//use Aws\S3\ObjectUploader;
use Aws\S3\MultipartUploader;
use Aws\Common\Exception\S3Exception;
use Aws\S3\S3Client;
use Aws\Exception\MultipartUploadException;
require 'aws-autoloader.php';
    $uploaddir = 'uploads/';
    $uploadfile = $uploaddir . basename($_FILES['userfile']['name']);
    echo "1";
    $s3_client = new S3Client([
      'profile' => 'default',
      'version' => 'latest',
      'region' => 'ap‐southeast‐2']);
    echo "2";

    $bucketName = 'ramyaassignment1b';
    $key ='a.jpg';

    echo "<p>";

    if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {
      echo "File is valid, and was successfully uploaded.\n";
      echo "3";
      //$uploadfile= dirname(__FILE__).'uploads/a.jpg';
      $uploader = new MultipartUploader( $s3_client, $uploadfile, ['bucket'=>$bucketName, 'key'=>basename($_FILES['userfile']['name'])]);
      //$uploader = new ObjectUploader($s3_client,$bucketName,$key,$uploadfile);
      echo "4";
          try {
            $uploader->upload();
            echo "5";
    //echo "Upload complete: {$result['ObjectURL']}\n";
} catch (MultipartUploadException $e) {
    echo $e->getMessage() . "\n";
    echo "6";
}
    } else {
       echo "Upload failed";
}
    ?>

---

猜测
$uploader.getState（）
给出了错误
PHP警告：未捕获错误：调用未定义的函数getState（）
，可能您的意思是执行
$uploader->getState（）即使我也对该语句进行了注释，也无法获得输出：（@alistaircol