<?xml version="1.0" encoding="UTF-8"?>
<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2007-01-01/">
    <Name>hello-world</Name>
    <Prefix></Prefix>
    <Marker></Marker>
    <MaxKeys>1000</MaxKeys>
    <IsTruncated>false</IsTruncated>
    <Contents>
        <Key>data-1.json</Key>
        <LastModified>2017-01-01T10:00:00.000Z</LastModified>
        <ETag>"1234567890qwertyui"</ETag>
        <Size>12345</Size>
        <StorageClass>STANDARD</StorageClass>
    </Contents>
</ListBucketResult>

$s3 = new AwsS3S3Client([
    'version' => '2007-01-01',
    'region'  => 'ca-central-1'
]);

$result = $s3->getObject([
    'Bucket' => 'hello-world',
    'Key'    => 'data-1.json'
]);

echo $result['Body'];