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 * Copyright 2018 Google Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * For instructions on how to run the full sample:
 * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/master/firestore/README.md
namespace Google\Cloud\Samples\Firestore;
use Google\Cloud\Firestore\FirestoreClient;
 * Delete a collection.
 * @param string $projectId The Google Cloud Project ID
 * @param string $collectionName
 * @param int $batchSize
# [START fs_delete_collection]
# [START firestore_data_delete_collection]
function data_delete_collection(string $projectId, string $collectionName, int $batchSize)
    // Create the Cloud Firestore client
    $db = new FirestoreClient([
        'projectId' => $projectId,
    $collectionReference = $db->collection($collectionName);
    $documents = $collectionReference->limit($batchSize)->documents();
    while (!$documents->isEmpty()) {
        foreach ($documents as $document) {
            printf('Deleting document %s' . PHP_EOL, $document->id());
            $document->reference()->delete();
        $documents = $collectionReference->limit($batchSize)->documents();
# [END firestore_data_delete_collection]
# [END fs_delete_collection]
// The following 2 lines are only needed to run the samples
require_once __DIR__ . '/../../testing/sample_helpers.php';
\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);

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