msgpack_unpack() returns success while there's 'Extra bytes' warning

[zhangbiao2009]

Hello, when I use msgpack_unpack() to unpack some data, it returns success and there's PHP Warning:
[msgpack] (php_msgpack_unserialize) Extra bytes in a.php on line 4

Is there any way to capture this kind of error? since it returns success I can't differentiate it from normal success situation.

Thanks!