fungos/hiphop-php — comment on commit bb40f00a1ff13b3fe55fa5a9576cc911ea49b088
File: src/runtime/ext/ext_session.cpp line 338
By fungos:

Here I have a question, was this missing flag accidental or do you planned this?

The issue here is that the session code generated by the hash was being returned in hex representation, then afterwards it was coded into another string by the function bin_to_readable. But this differs from PHP, as the resulting string would be a very large one composed of just numbers where the PHP does is to use bin_to_readable with the hash raw data (binary data).

To me that looks like a misfeature (bug).