If you look at what is it called when encrypt('a') + encrypt('a') == encrypt('aa')? you'll see the first code snippet is indented all weirdly, however, if you try to edit the post, you'll see that every line has the same indentation and that it's just crypto.stackexchange.org that's indenting it weirdly.
However, I'm not able to duplicate that issue on their meta or on this meta, as demonstrated thusly:
<?php $mcrypt = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, ''); mcrypt_generic_init($mcrypt, '@@@@@@@@', 'xxxxxxxx'); echo bin2hex(mcrypt_generic($mcrypt, 'dddddddd')); echo "\r\n"; echo bin2hex(mcrypt_generic($mcrypt, 'dddddddd'));
So any idea what's up with the crypto.stackexchange.com post? Is this a SE bug? Maybe crypto.stackexchange.com is running an older version of SE than their meta or this SE is?