This is a Flysystem adapter for the aws-sdk-php v3.
composer require league/flysystem-aws-s3-v3Using standard Aws\S3\S3Client:
<?php
use Aws\S3\S3Client;
use League\Flysystem\AwsS3v3\AwsS3Adapter;
use League\Flysystem\Filesystem;
include __DIR__ . '/vendor/autoload.php';
$client = new S3Client([
    'credentials' => [
        'key'    => 'your-key',
        'secret' => 'your-secret'
    ],
    'region' => 'your-region',
    'version' => 'latest|version',
]);
$adapter = new AwsS3Adapter($client, 'your-bucket-name');
$filesystem = new Filesystem($adapter);or using Aws\S3\S3MultiRegionClient which does not require to specify the region parameter:
<?php
use Aws\S3\S3MultiRegionClient;
use League\Flysystem\AwsS3v3\AwsS3Adapter;
use League\Flysystem\Filesystem;
include __DIR__ . '/vendor/autoload.php';
$client = new S3MultiRegionClient([
    'credentials' => [
        'key'    => 'your-key',
        'secret' => 'your-secret'
    ],
    'version' => 'latest|version',
]);
$adapter = new AwsS3Adapter($client, 'your-bucket-name');
$filesystem = new Filesystem($adapter);