facebook/hhvm — pull request #2994 by yaslama (2014-06-20 10:11:18+00:00)
Title: Fix Memcache::get($keys) when $keys is an array

Without this patch, the result of the test is:

array(2) {
["abcdef1"]=>
string(13) "value:abcdef1"
["abcdef13"]=>
string(14) "value:abcdef13"
}

This fix is needed for drupal (with the memcache module).