PHP - Get most recently modified file from s3 bucket

s3_bucket_most_recent.php

<?php

require './aws.phar';

use Aws\S3\S3Client;

$s3 = S3Client::factory(array(
  'key'    => 'YOUR_KEY',
  'secret' => 'YOUR_SECRET',
  'region' => 'YOUR_REGION',
  'signature' => 'v4',
  'version' => 'latest',
));

$bucket = 'YOUR_BUCKET';

$objects = $s3->getIterator('ListObjects', array(
  "Bucket" => $bucket,
));

// initialize with a 0 DateTime
$most_recent = array('LastModified' => date(0));

foreach ($objects as $object) {
  // DateTime result
  $last_modified = $object['LastModified'];

  if ($last_modified > $most_recent['LastModified']) {
    $most_recent = $object;
  }
}

var_dump($most_recent);