How to get collection class object from mongodb/driver/manager in PHP - php

Question

I am using the (current? not sure, php documentation is very opaque to me) method to connect to a MongoDB from PHP:
$manager = new MongoDB\Driver\Manager("mongodb://{$user}:{$pwd}#{$url}", array("ssl" => true), array("context" => $ctx));
From there, if I want to write something I do the following:
$bson = MongoDB\BSON\fromJSON($newData);
$value = MongoDB\BSON\toPHP($bson);
$bulk = new MongoDB\Driver\BulkWrite;
$bulk->update(
$filter,
['$set' => $value],
['multi' => false, 'upsert' => $upsert]
);
$results = $manager->executeBulkWrite("$DB.$collection", $bulk);
var_dump($results);
All the documentation on the MongoDB PHP tutorials starts with a $collection object... and the functions thereafter seem much more user-friendly (getInsertedID... insertOne...find...findOne...etc).
For example:
<?php
$collection = (new MongoDB\Client)->test->users;
$insertManyResult = $collection->insertMany([
[
'username' => 'admin',
'email' => 'admin#example.com',
'name' => 'Admin User',
],
[
'username' => 'test',
'email' => 'test#example.com',
'name' => 'Test User',
],
]);
printf("Inserted %d document(s)\n", $insertManyResult->getInsertedCount());
var_dump($insertManyResult->getInsertedIds());
It is not clear to me, how they are actually connecting to the DB... how would I go from the $manager connection to a $collection?
On the MongoDB PHP documentation page, it says 'You can construct collections directly using the driver’s MongoDB\Driver\Manager class'. Unfortunately, a search on the resulting page doesn't include the word 'collection' other than as a side comment in a user contributed note'
Elsewhere on the MongoDB PHP reference pages, I see nowhere that the MongoDB\Manager class is described.
So, how do I get access to the many features in the MongoDB\Collection class?

Answer 1

I was not able to get a collection out of the Manager class, however, I was able to use the bulkWrite class to execute an insert in a secure fashion (I believe). I expect the same pattern will work for reads and updates as well.
Code snippet for those that come here after me:
//echo "Specify the cert...";
$SSL_DIR = ".";
$SSL_FILE = "XXXXXX.pem";
$ctx = stream_context_create(array(
"ssl" => array(
"cafile" => $SSL_DIR . "/" . $SSL_FILE,
))
);
//echo "Done\n";
// echo "Creating manager...";
$manager = new MongoDB\Driver\Manager("mongodb://{$user}:{$pwd}#{$url}", array("ssl" => true), array("context" => $ctx));
// echo "Done!\n";
// echo "Making BSON...";
$bson = MongoDB\BSON\fromJSON($newData);
// echo "Done!\nMaking Value...";
$value = MongoDB\BSON\toPHP($bson);
$value->_id = (string) new MongoDB\BSON\ObjectID;
// echo "Done!\nMaking Bulk...";
$bulk = new MongoDB\Driver\BulkWrite;
$bulk->insert($value);
// echo "Done!\nExecuting Bulk Write";
$results = $manager->executeBulkWrite("$db.$collection", $bulk);
if($results->getInsertedCount()==1) {
echo $value->_id;
} else {
echo $results->getWriteErrors();
}
// echo "Done!\n";