Throw exceptions when not possible to unpack

[adanlobato]

We're attempting to include MsgPack as one possible serializer for our suite but we found the problem that when it is not possible to unpack data, msgpack_unpack triggers an error.

This is a big problem because in PHP it is not possible to capture a PHP error and act accordingly, so I propose two solutions:

• Create a MessagePackException that is thrown whenever an error occurs. This can be easily try/catch'ed in a controlled way. This would be great por the OO API (MsgPack class).
• Return a specific value when a problem occurs (false, for example) and add a msgpack_last_error() function that returns information about how it was the last unpack operation. This is the behaviour used by the JSON lib on PHP. http://www.php.net//manual/en/function.json-last-error.php

[ghost]

That would be great! :+1:

[rybakit]

:+1: