Quite a few of these spewing out

$query = http_build_query( $req['query'], '', '&', PHP_QUERY_RFC3986 );

function http_build_query (array $formdata, $numeric_prefix = null, $arg_separator = null, $enc_type = PHP_QUERY_RFC1738) {}

http://www.php.net/manual/en/function.http-build-query.php

PHP 5.4 - The enc_type parameter was added.

Caused by https://gerrit.wikimedia.org/r/#/c/101226/ as WMF doesn't use PHP 5.4 yet

Appears to have been fixed in gerrit 106624.

(In reply to comment #4)

Appears to have been fixed in Gerrit change #106624.

Thanks, I thought I linked that in a comment here...