facebook/facebook-php-sdk-v4 — pull request #125 by itsgoingd (2014-06-17 14:20:12+00:00)
Title: Explicitly set arg separator to "&" in http_build_query calls.

The value of "arg_separator.output" ini setting is used as separator by default, what causes the SDK to not work properly on PHP installations where "arg_separator.output" is set to anything else then "&".