https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/OAjW-u5Z7bM

rp.php

<?php

$mongoClient = new MongoClient('mongodb://localhost');
$collection = $mongoClient->selectCollection('mydb', 'customers');

// Assume $parms exists as an associative array (perhaps from $_POST)
$rp = 'listcustomer';

switch ($rp) {
    case 'listcustomers':
        $cursor = $collection->find([], ['_id' => 1, 'name' => 1]);
        $jsonResult = json_encode(iterator_to_array($cursor));
        break;

    case 'getcustomer':
        $document = $collection->findOne(['_id' => new MongoId($parms['_id'])]);
        $jsonResult = json_encode($document);
        break;

    case 'setcustomer':
        if (empty($parms['_id'])) {
            $parms['_id'] = new MongoId($parms['_id']);
        } else {
            // Unset the _id, since save() will create one
            unset($parms['_id']);
        }

        $collection->save($parms);
        $jsonResult = json_encode(['_id' => (string) $parms['_id']]);
        break;

    case "deletecustomer":
        $collection->remove(['_id' => new MongoId($parms['_id'])]);
        $jsonResult = json_encode(['_id' => (string) $parms['_id']]);
        break;

    default:
        $jsonResult = json_encode(['error' => 'unsupported rp']);
}

echo $jsonResult;