Profiling MongoDB queries

profiling.php

<?php

require 'vendor/autoload.php';

$client = new MongoDB\Client();
$db = $client->selectDatabase('test');

// Disable profiling before dropping system.profile
$db->command(['profile' => 0]);

$profileCollection = $db->selectCollection('system.profile');
$profileCollection->drop();

// Enable profiling for all queries
$db->command(['profile' => 2]);

$collection = $db->selectCollection('foo');
$collection->drop();
$collection->insertOne(['x' => 1]);
$collection->findOne(['x' => 1]);

// Disable profiling again
$db->command(['profile' => 0]);

// Query profile for all insert operations
foreach ($profileCollection->find(['op' => 'insert']) as $document) {
    var_dump($document);
}