heroku/heroku-buildpack-php — pull request #67 by aheusser (2014-07-24 22:30:39+00:00)
Title: Revised New Relic logging approach to go to file instead of stderr.

Updated the bin/heroku-php-* and bin/heroku-hhvm-* to include the
New Relic log files (there are 2 of them) in the stuff redirected to
$wait_pipe. This approach should allow "heroku logs -t" to include
content from both the New Relic PHP Agent and Daemon logs.