Works quite well for me, tested with OpenLDAP 2 libs,
Linux, Apache and 4.0.6. In ldap_search you must
specify the attributes, I've tested the following:

Get all the normal attributes and operation attributes:
$sr=ldap_search($ds, $base, $filter, array("*","+"));

Get operation attributes only:
$sr=ldap_search($ds, $base, $filter, array("+"));

Note that + is an OpenLDAP server extension

$sr=ldap_search($ds, $base, $fiter,
                array("modifiersName", "modifyTimestamp",           
                      "creatorsName", "createTimestamp"));

All of these worked fine. What I did to look at the data
was:

$info = ldap_get_entries($ds, $sr);
var_dump($info);

Note that the attribute names are all in lower case in
the result. Maybe this was your error?

I'm closing this now, reopen and submit a shortest
possible script demonstrating the problem if you
still think there is one.