What type of encoding is this? I am told it's Bencode, but it doesn't look standard [closed]

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Closed 7 years ago.

I'm working on a project in which they have stored the following type of encoded data in a BLOB type column of a mysql database. I've asked around and have been told this is Bencode, however, from what I'm seeing online it doesn't appear to be standard Bencode.

Wiki for Bencode

http://en.wikipedia.org/wiki/Bencode

Example of encoded data

a:11:{i:0;a:3:{s:11:"question_id";s:2:"46";s:6:"answer";s:1:"2";s:7:"correct";b:1;}i:1;a:3:{s:11:"question_id";s:2:"45";s:6:"answer";s:1:"2";s:7:"correct";b:0;}i:2;a:3:{s:11:"question_id";s:2:"44";s:6:"answer";s:1:"2";s:7:"correct";b:0;}i:3;a:3:{s:11:"question_id";s:2:"43";s:6:"answer";s:1:"1";s:7:"correct";b:0;}i:4;a:3:{s:11:"question_id";s:2:"42";s:6:"answer";s:1:"3";s:7:"correct";b:0;}i:5;a:3:{s:11:"question_id";s:2:"41";s:6:"answer";s:1:"2";s:7:"correct";b:0;}i:6;a:3:{s:11:"question_id";s:2:"40";s:6:"answer";s:1:"0";s:7:"correct";b:1;}i:7;a:3:{s:11:"question_id";s:2:"39";s:6:"answer";s:1:"0";s:7:"correct";b:0;}i:8;a:3:{s:11:"question_id";s:2:"38";s:6:"answer";s:1:"1";s:7:"correct";b:1;}i:9;a:3:{s:11:"question_id";s:2:"37";s:6:"answer";s:1:"3";s:7:"correct";b:0;}i:10;a:3:{s:11:"question_id";s:2:"36";s:6:"answer";s:1:"2";s:7:"correct";b:1;}}

What I've noticed so far

I've noticed that the encoding describes different types of data using letters and integers similar to Bencode.

Example: s:11:"question_id";

I'm assuming s stands for 'string', and that 11 is defining the length of the string question_id. Also, it would appear that the beginning of the data (a:11:) describes an array with a length of 11. While this is similar to standard Bencode, it doesn't seem to use the standard syntax that Bencode uses.

Does anyone have any ideas what type of encoding this is? Is this a non-standard Bencode format, or something entirely different? I'm looking for a parser in PHP or Python, and having a name for the encoding would definitely help in my search.

回答1:

It's the PHP serialization format, unserializable using unserialize.
See http://codepad.org/l7Z9cITo.

来源：https://stackoverflow.com/questions/12320327/what-type-of-encoding-is-this-i-am-told-its-bencode-but-it-doesnt-look-stand