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How do you force a file to download from Amazon S3 using the Amazon SDK for PHP?
header("Content-type: $filetype");
header("Content-Disposition: filename="".$filename.""");
$response = $s3->get_object(AMAZON_BUCKET, $filepath);
echo $response->body;

$response = $s3->get_object(AMAZON_BUCKET, $filepath, array(
      'response' => array(
        'content-type' => $filetype,
        'content-disposition' => 'attachment'
       )
    ));