- strtoupper: documentation ( source)
- md5: documentation ( source)
<?php
$hashSecretWord = 'MDBhOWVkZWYtYzk4ZS00MTFlLWE2NTgtZWY4MDg2NGJlMTJl';
$hashSid = '901308474';
$hashOrder = '9093730211037';
$hashTotal = '22.00';
echo strtoupper(md5($hashSecretWord . $hashSid . $hashOrder . $hashTotal));