Get Identities Operation

// Create a document with an identity ID:
// ======================================

$session = $store->openSession();
try {
    // Request the server to generate an identity ID for the new document. Pass:
    //   * The entity to store
    //   * The collection name with a pipe (|) postfix
    $company = new Company();
    $company->setName("RavenDB");
    $session->store($company, "companies|");

    // If this is the first identity created for this collection,
    // and if the identity value was not customized
    // then a document with an identity ID "companies/1" will be created
    $session->saveChanges();
} finally {
    $session->close();
}

// Get identities information:
// ===========================

// Define the get identities operation
$getIdentitiesOp = new GetIdentitiesOperation();

// Execute the operation by passing it to Maintenance.Send
/** @var array $identities */
$identities = $store->maintenance()->send($getIdentitiesOp);

// Results
$latestIdentityValue = $identities["companies|"]; // => value will be 1

GetIdentitiesOperation();