Riak client for PHP. Formula was removed
Last versions were
php53-riak requires the following formulae to be installed:
autoconf 2.69 Automatic configure script builder
riak 2.2.3 Distributed database

Recent formula history

Mike McQuaid Deprecate tap.
Mike McQuaid php53-riak: use <<~EOS.
Andreas Braun Add description for riak formula
Andy Blyler php53-riak: convert from sha1 to sha256
Andy Blyler fix style issues

Formula code at GitHub