MongoDB\Model\CollectionInfo::getInfo()

<?php
$db = (new MongoDB\Client)->test;
// Creates a view with the readOnly option set to "true"
$db->createCollection(
   'myView',
   ['viewOn' => 'myCollection'],
   ['readOnly' => true]
);
// Retrieves information about the collection view
foreach ($db->listCollections(['filter' => ['name' => 'myView']]) as $info) {
   var_dump($info->getInfo());
}

array(1) {
  ["readOnly"]=>
  bool(true)
}