Create a zip from objects from S3.

build-zip-from-s3.php

<?php

// These are just the basics for how to do this. Notes:
// - Not fully tested.
// - Not suitable for production.
// - May not work well if large ammounts of data.
// - Requires AWS SDK for PHP and http://php.net/manual/en/book.zip.php

require '/path/to/sdk-or-autoloader';

$s3 = Aws\S3\S3Client::factory(/* sdk config */);
$s3->registerStreamWrapper();

$zip = new ZipArchive;
$zip->open('/path/to/zip-you-are-creating.zip', ZipArchive::CREATE);

$bucket = 'your-bucket';
$objects = $s3->getIterator('ListObjects', array(
    'Bucket' => $bucket,
    // other params...
));

foreach ($objects as $object) {
    $contents = file_get_contents("s3://{$bucket}/{$object['Key']}");
    $zip->addFromString($object['Key'], $contents);
}

$zip->close();