I noticed something quite strange when using the mcrypt library to encrypt data.

say i would encrypt $data in mode ECB:
$l = mcrypt_encrypt(MCRYPT_BLOWFISH, $key, $data, MCRYPT_MODE_ECB, $iv);

then decrypt it:
$l = mcrypt_decrypt(MCRYPT_BLOWFISH, $key, $data, MCRYPT_MODE_ECB, $iv);

It seems like the padding prevents me from using the variable correctly in some conditions.
As explained in the documentation, the padding is made of '\0' and in the following example:

<? exec("echo.sh $l foobar", $value, $return);

exec would actually stop at $l because of the '\0' and not pass the 'foobar' arg.
I don't know if this is a known bug or a "supposed" behaviour, but it is surely annoying  :)