If you happen to be decrypting something encrypted in ColdFusion, you'll discover that its encrypt function apparently pads the plaintext with ASCII 4, the "end of transmission" character.
Building on eddiec's code, you can remove both nulls and EOTs with this:
<?php
$retval = mcrypt_decrypt( ...etc ...);
$retval = rtrim($retval, "\0\4"); // trim ONLY the nulls and EOTs at the END
?>
----
Server IP: 208.69.120.35
Probable Submitter: 67.167.138.237
----
Manual Page -- http://www.php.net/manual/en/function.mcrypt-decrypt.php
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