Hi,
just a quick heads up, that Ops are about to add a “php” key to the X-Analytics header (i.e.: for sampled-1000 logs, hive, ...):
https://gerrit.wikimedia.org/r/#/c/156793/
This header will hold the used PHP implementation [1]. Planned deployment is between 2014-09-01 and 2014-09-02.
Have fun, Christian
[1] https://wikitech.wikimedia.org/wiki/X-Analytics#Keys