递增firestore中的字段(php)

use Google\Cloud\Firestore\FirestoreClient;
use Google\Cloud\Core\Timestamp;

$firestore = new FirestoreClient();

$documentPath = 'your-collection/your-document';
$fieldPath = 'your-field';
$incrementValue = 1;

$firestore->runTransaction(function (Transaction $transaction) use ($firestore, $documentPath, $fieldPath, $incrementValue) {
    $document = $firestore->document($documentPath);
    $snapshot = $transaction->snapshot($document);
    $currentValue = $snapshot->get($fieldPath);
    $newValue = $currentValue + $incrementValue;
    $transaction->update($document, [
        [$fieldPath, $newValue]
    ]);
});