tpyo/amazon-s3-php-class — pull request #81 by ptarjan (2014-05-15 00:28:02+00:00)
Title: Don't take curl callback by ref

Changing these does nothing to the caller, why would you take them by ref? HHVM doesn't promote this to refs if they can't be modified: https://github.com/facebook/hhvm/issues/2587