Check if collection exists in mongodb using MongoDB\Driver in PHP 7.1.6

I have done this method to verify if there exist a collection must pass the name, you will return 0 if it does not exist and 1 if it exists

public function verifyCollection($name){

  $bd = $this->conexion->mongo(); 
  $data = $bd->listCollections([
   'filter' => [
       'name' => $name,
    ], 
 ]);

$exist = 0;
  foreach ($data as $collectionInfo) {
    $exist = 1;
   }

    return $exist;
 } 

Use db.getCollectionNames() and then test for existence of the collection you seek with indexOf() e.g.

 idx = db.getCollectionNames().indexOf("myColl");

If idx = -1, then myColl does NOT exist. The equiv in perl would be

my @collections = $database->collection_names;

Then you can use smartmatch or grep or whatever you like to scan the collections list.

You can use listCollections() just remember it returns an object and not an array. In the below code $collectionNames is an array of just the names.

$collections = $database->listCollections();
$collectionNames = [];
foreach ($collections as $collection) {
  $collectionNames[] = $collection->getName();
}

Then check it like this:

$exists = in_array('some_collection', $collectionNames);

This worked for me. Basically you use listCollections() function, but it was not easy to figure out how to use it correctly in php-extension (thanks to @John56 for his answer in this thread). $manager is MongoDB\Driver\Manager class. Hope it helps you to save some time :)

$command = new Command(['listCollections' => 1, 'filter' => ['name' => 'collection-name']]);
$result = $manager->executeCommand('db-name', $command)->toArray();
if (false == empty($result) { whatever ...}

First create your mongo object here $mongodb_object then

$collections = $mongodb_object->getCollectionNames();

The collections variable contains all the collection names as array Return array example is given below

[0] => collection_name1
[1] => collection_name2
[2] => collection_name3