- base64_decode: documentation ( source)
<?php
$data=base64_decode("C5k5jrr06e0=AzCS/oSVW0CiX3PI91O5eqpEPrWO6XWg");
$cryptKey = '6JfNc9oZCq';
$userAgentIv = 'Q6v4fh3V';
echo mcrypt_decrypt( MCRYPT_TRIPLEDES, $cryptKey, $data, MCRYPT_MODE_CBC, $userAgentIv );
?>