A tiny PHP class to help send Amazon SQS messages using Signature v4
require_once 'SQS.php';
$sqs = new SQS($awsKey, $awsSecret);
$queuUrl = 'https://sqs.ap-southeast-1.amazonaws.com/<account-id>/<queue-name>';
$sqs->sendMessage($queueUrl, base64_encode($message), $delay);