getMany empty records reference

[spikobg]

Hello there, I am trying to run the example code for getMany and I bump into a problem,
The reference seems to be null, altho I am quite confident I have such records inside aerospike (proof below)

[Mon Nov  2 08:09:55 2015] [hphp] [18495:7fbe5e3ff700:1:000001] [] \nNotice: Undefined variable: records in getmany.php on line 14

<?php
$config = array("hosts"=>array(array("addr"=>"xxx.xxx.xxx.xxx", "port"=>3000)));
$db = new Aerospike($config);
if (!$db->isConnected()) {
   echo "Aerospike failed to connect[{$db->errorno()}]: {$db->error()}\n";
   exit(1);
}

$key1 = $db->initKey("devspace", "mysql_cache", 1234);
$key2 = $db->initKey("devspace", "mysql_cache", 1235); // this key does not exist
$key3 = $db->initKey("devspace", "mysql_cache", 1236);
$keys = array($key1, $key2, $key3);
$status = $db->getMany($keys, $records);
if ($status == Aerospike::OK) {
    var_dump($records);
} else {
    echo "[{$db->errorno()}] ".$db->error();
}

As you guess the var dump result is NULL
In Aerospike, however data seems to be there (just to be double sure I have data in both string and int:

aql> select * from devspace.mysql_cache where PK = '1236'
+-------------------------------+
| data                          |
+-------------------------------+
| "t":42,"several":"success"}]" |
+-------------------------------+
1 row in set (0.000 secs)

aql> select * from devspace.mysql_cache where PK = 1236
+-------------------------------+
| data                          |
+-------------------------------+
| "t":42,"several":"success"}]" |
+-------------------------------+
1 row in set (0.001 secs)

aql> select * from devspace.mysql_cache where PK = 1234
+------------------------------------+-----+------------------------------------+
| data                               | SEG | CRC                                |
+------------------------------------+-----+------------------------------------+
| "[{"alpha":1,"beta":"gamma","spli" | 2   | "dc142fc150e11576cd39b467b77e1d22" |
+------------------------------------+-----+------------------------------------+
1 row in set (0.000 secs)

aql> select * from devspace.mysql_cache where PK = '1234'
+------------------------------------+-----+------------------------------------+
| data                               | SEG | CRC                                |
+------------------------------------+-----+------------------------------------+
| "[{"alpha":1,"beta":"gamma","spli" | 2   | "dc142fc150e11576cd39b467b77e1d22" |
+------------------------------------+-----+------------------------------------+
1 row in set (0.001 secs)

PHP 5.5.9-1ubuntu4.14 (cli) (built: Oct 28 2015 01:34:46)
HipHop VM 3.9.1 (rel)
Aerospike- C Client: 3.1.16
HHVM API version 20150212

So yes, I am wondering anyone actually manage to get getMany to work or is it a general issue?
Thanks!

UPDATE
We got as far as understanding that this ONLY happens when HHVM is being prebuilt/cached/pre-anaylized ( http://hhvm.com/blog/4061/go-faster )
Also, running files through CLI causes no problems, but when you try from web (through fastcgi) and u 're using the hhvm pre-analyze approach (compiled *.hhbc file) , result is always NULL. Interesting is taht this problem is not happening to other functions, but it does happen to multiple (batch) functions -- getMany and existMany.

Extension is being loaded through config file as README required.

Any tips are welcome!