How to execute mongodb query in php

I'm in a situation where I need to be able to run a direct mongodb query from inside of PHP, and am having troubles with the execute() function.

The following code will correctly execute and return a result from the database:

$m = new MongoClient();
$db = $m->;
print_r($db->execute('db..count()'));

However, if I replace count() with find() I get the following result:

Array
(
    [retval] => Array
        (
            [value] => DBQuery: .-> undefined
        )

    [ok] => 1
)

Why does one of these queries work, and the other fail? And how can I overcome this issue? I've thought about writing something that will convert a MongoDB query into the necessary array format for the PHP Mongo library to work with, but that would be a lot of work that I don't want to go through.

This is the same problem that was brought up here: How to access MongoDB profile in PHP? - but no answers were given at that time.

This question: PHP MongoDB execute() locking collection utilizes the execute() method with find() and they say it works for them, but I'm not sure how.

Update:

So I'd updated mongo in pecl, but that didn't solve anything. However, I also did a YUM update, and that provided a separate package update for php-pecl-mongo-1.2.12-1.el6.x86_64 that brought me to 1.3.4-1.

Now, $db->execute('db..find()) returns something...but not at all what I expect. Instead of returning a MongoCursor object instead an Array is returned, and while it has a retval field, there's no actual information in there from the query performed. It looks like this:

Array
(
    [retval] => Array
        (
            [_mongo] => Array
                (
                    [slaveOk] =>
                    [host] => EMBEDDED
                )

            [_db] => Array
                (
                    [_mongo] => Array
                        (
                            [slaveOk] =>
                            [host] => EMBEDDED
                        )

                    [_name] => test
                )

            [_collection] => Array
                (
                    [_mongo] => Array
                        (
                            [slaveOk] =>
                            [host] => EMBEDDED
                        )

                    [_db] => Array
                        (
                            [_mongo] => Array
                                (
                                    [slaveOk] =>
                                    [host] => EMBEDDED
                                )

                            [_name] => test
                        )

                    [_shortName] => hits
                    [_fullName] => test.hits
                )

            [_ns] => test.hits
            [_query] => Array
                (
                )

            [_fields] =>
            [_limit] => 0
            [_skip] => 0
            [_batchSize] => 0
            [_options] => 0
            [_cursor] =>
            [_numReturned] => 0
            [_special] =>
        )

    [ok] => 1
)

As you can see, there's not actually anything from the database there: how do I get to my actual rows?

$filter = [];
        if (!empty($mail_brand)) {
            $filter['mx.brand_id'] = intval($mail_brand);
        }
        if (!empty($contacttool_brand)) {
            $filter['contacttool.brand_id'] = intval($contacttool_brand);
        }
        if ($mx_switch_title == 20 || empty($province)) {
            $filter["wwwtitle"] = ['$ne' => null];
        }
        //网站标题
        if (!empty($wwwtitle)) {
            $filter['wwwtitle'] = new \MongoDB\BSON\Regex(".*{$wwwtitle}.*", '');
        }
        //只带mx的查询
        if ($mx_on_switch == 20 || empty($province)) {
            $filter["mx"] = ['$exists' => true];
        }
        //mx模糊查询
        if (!empty($mx_vague_check)) {
            $filter["mx.mx"] = new \MongoDB\BSON\Regex(".*{$mx_vague_check}.*", '');
        }

        //如果没有传递省份
        if (empty($province)) {
            $province = "shandong";
        }
        try {
            $options_base = ['connectTimeoutMS' => 500000, 'socketTimeoutMS' => 500000];
            $manager = new \MongoDB\Driver\Manager(C('mongodb_auth_url'), $options_base);
//            $readPreference = $manager->getReadPreference();
//            $server = $manager->selectServer($readPreference);
            $coll = C('default_db') . '.' . $province;
            $options = [
                "skip" => $page,
                "limit" => $rows,
                'projection' => ['createdate' => 0,
                    'expiresdate' => 0,
                    'registrant_city' => 0,
                    'registrant_street' => 0,
                    'registrant_state' => 0,
                    'updatedate' => 0,
                    'whoisserver_id' => 0,
                    'registrar_name_id' => 0,
                    'id' => 0,
                ],
            ];
            //查询记录总的数量
            $commands = [
                'count' => $province,
                'query' => $filter
            ];
            $command = new \MongoDB\Driver\Command($commands);
            $cursor = $manager->executeCommand('mxmanage', $command);
            $info = $cursor->toArray();
            $count = $info[0]->n;
            $query = new \MongoDB\Driver\Query($filter, $options);
            $rows = $manager->executeQuery($coll, $query);
            $info = [];
            foreach ($rows as $document) {
                $doc = (array)$document;
                $doc['_id'] = (string)$doc['_id'];
                $doc['mail_brand_name'] = $doc['mx']->brand_name;
                $doc['mail_mx'] = $doc['mx']->mx ?: '';
                $doc['contacttool_brand_name'] = $doc['contacttool']->brand_name;
                $doc['mx_changetime'] = !$doc['mx_changetime'] ? '' : date('Y-m-d H:i', $doc['mx_changetime']);
                $doc['contacttool_changetime'] = !$doc['contacttool_changetime'] ? '' : date('Y-m-d H:i', $doc['contacttool_changetime']);
                unset($doc['mx']);
                unset($doc['contacttool']);
                $info[] = $doc;
            }
        } catch (\MongoDB\Driver\Exception $e) {
            echo $e->getMessage(), "\n";
            exit;
        }