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 * Copyright 2016 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/spanner/README.md
namespace Google\Cloud\Samples\Spanner;
// [START spanner_read_data_with_index]
use Google\Cloud\Spanner\SpannerClient;
 * Reads sample data from the database using an index.
 * The index must exist before running this sample. You can add the index
 * by running the `add_index` sample or by running this DDL statement against
 * your database:
 *     CREATE INDEX AlbumsByAlbumTitle ON Albums(AlbumTitle)
 * Example:
 * read_data_with_index($instanceId, $databaseId);
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
function read_data_with_index($instanceId, $databaseId)
    $spanner = new SpannerClient();
    $instance = $spanner->instance($instanceId);
    $database = $instance->database($databaseId);
    $keySet = $spanner->keySet(['all' => true]);
    $results = $database->read(
        'Albums',
        $keySet,
        ['AlbumId', 'AlbumTitle'],
        ['index' => 'AlbumsByAlbumTitle']
    foreach ($results->rows() as $row) {
        printf('AlbumId: %s, AlbumTitle: %s' . PHP_EOL,
            $row['AlbumId'], $row['AlbumTitle']);
// [END spanner_read_data_with_index]
// 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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