Upload directory recursively and concurently to AWS S3

uplaodS3.php

require_once __DIR__.DIRECTORY_SEPARATOR.'Aws'.DIRECTORY_SEPARATOR.'aws-autoloader.php';
// require_once './vendor/autoload.php'  if you composer

$ds = DIRECTORY_SEPARATOR;
$srcDir = 'your src dir;
$filePath = [];
$promises = [];
$bucket = 'your bucket';
$options = [
    'version' => 'latest',
    'region' => 'your S3 region',
    'credentials' => [
        'key' => 'your S3 key',
        'secret' => 'your S3 secret'
    ],
    'debug' => false
];
$s3Client = new Aws\S3\S3Client($options); // remember check timestamp
try {
	$filePath = recursiveGetFilePath($srcDir);
	foreach ($filePath as $path) {
		if ((basename($path) == ".") || (basename($path) == "..") || is_dir($path)) {
			continue;
		}
		
		// http://stackoverflow.com/questions/7039771/upload-a-file-to-s3-buckets-folder-using-asp-net-sdk
		$key = explode($srcDir.'/', $path)[1];
		
		// use GuzzleHttp promise to upload concurrently
		// check:
		//       https://github.com/guzzle/promises
		//       http://blogs.aws.amazon.com/php/
		//       http://docs.aws.amazon.com/aws-sdk-php/v3/guide/guide/promises.html
		$promises[] = $s3Client->putObjectAsync([
			'ACL' => 'public-read',
			'Bucket' => $bucket,
			'Key' => $key,
			'SourceFile' => $path
		]);
	}
	$allPromise = \GuzzleHttp\Promise\all($promises);
	$allPromise->wait();
} catch (Aws\S3\Exception\S3Exception $e) {
  	echoLine('S3: ' . $e->getMessage());
} catch (Aws\Exception\AwsException $e) {
    echoLine('Aws: ' . $e->getAwsRequestId());
    echoLine('Aws: ' . $e->getAwsErrorType());
    echoLine('Aws: ' . $e->getAwsErrorCode());
}

function echoLine ($str) {
	echo $str.'<br>';
}

function recursiveGetFilePath ($target) {
	if (is_dir($target)) {
		return new RecursiveIteratorIterator(new RecursiveDirectoryIterator($target), RecursiveIteratorIterator::SELF_FIRST);
	}
	return [
	    $target
	];
}