# Managing visibility timeout in Amazon SQS with AWS SDK for PHP Version 3
<a name="sqs-examples-managing-visibility-timeout"></a>

A visibility timeout is a period of time during which Amazon SQS prevents other consuming components from receiving and processing a message. To learn more, see [Visibility Timeout](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html).

The following example shows how to:
+ Change the visibility timeout of specified messages in a queue to new values, using [ChangeMessageVisibilityBatch](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-sqs-2012-11-05.html#changemessagevisibilitybatch).

All the example code for the AWS SDK for PHP is available [here on GitHub](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/php/example_code).

## Credentials
<a name="examplecredentials"></a>

Before running the example code, configure your AWS credentials, as described in [Authenticating with AWS using AWS SDK for PHP Version 3](credentials.md). Then import the AWS SDK for PHP, as described in [Installing the AWS SDK for PHP Version 3](getting-started_installation.md).

## Change the visibility timeout of multiple messages
<a name="change-the-visibility-timeout-of-multiple-messages"></a>

 **Imports** 

```
require 'vendor/autoload.php';

use Aws\Exception\AwsException;
use Aws\Sqs\SqsClient;
```

 **Sample Code** 

```
$queueUrl = "QUEUE_URL";

$client = new SqsClient([
    'profile' => 'default',
    'region' => 'us-west-2',
    'version' => '2012-11-05'
]);

try {
    $result = $client->receiveMessage(array(
        'AttributeNames' => ['SentTimestamp'],
        'MaxNumberOfMessages' => 10,
        'MessageAttributeNames' => ['All'],
        'QueueUrl' => $queueUrl, // REQUIRED
    ));
    $messages = $result->get('Messages');
    if ($messages != null) {
        $entries = array();
        for ($i = 0; $i < count($messages); $i++) {
            $entries[] = [
                'Id' => 'unique_is_msg' . $i, // REQUIRED
                'ReceiptHandle' => $messages[$i]['ReceiptHandle'], // REQUIRED
                'VisibilityTimeout' => 3600
            ];
        }
        $result = $client->changeMessageVisibilityBatch([
            'Entries' => $entries,
            'QueueUrl' => $queueUrl
        ]);

        var_dump($result);
    } else {
        echo "No messages in queue \n";
    }
} catch (AwsException $e) {
    // output error message if fails
    error_log($e->getMessage());
}
```