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paginated_query_cursor.php
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paginated_query_cursor.php
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<?php
/**
* 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;
/**
* Paginate using cursor queries.
* ```
* paginated_query_cursor('your-project-id');
* ```
*/
function paginated_query_cursor($projectId)
{
// Create the Cloud Firestore client
$db = new FirestoreClient([
'projectId' => $projectId,
]);
# [START fs_paginated_query_cursor]
$citiesRef = $db->collection('cities');
$firstQuery = $citiesRef->orderBy('population')->limit(3);
# Get the last document from the results
$documents = $firstQuery->documents();
$lastPopulation = 0;
foreach ($documents as $document) {
$lastPopulation = $document['population'];
}
# Construct a new query starting at this document
# Note: this will not have the desired effect if multiple cities have the exact same population value
$nextQuery = $citiesRef->orderBy('population')->startAfter([$lastPopulation]);
$snapshot = $nextQuery->documents();
# [END fs_paginated_query_cursor]
foreach ($snapshot as $document) {
printf('Document %s returned by paginated query cursor.' . PHP_EOL, $document->id());
}
}