List phone numbers opted out of Amazon SNS using an Amazon SDK

    public static void listOpts( SnsClient snsClient) {

        try {
            ListPhoneNumbersOptedOutRequest request = ListPhoneNumbersOptedOutRequest.builder().build();
            ListPhoneNumbersOptedOutResponse result = snsClient.listPhoneNumbersOptedOut(request);
            System.out.println("Status is " + result.sdkHttpResponse().statusCode() + "\n\nPhone Numbers: \n\n" + result.phoneNumbers());

        } catch (SnsException e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }
    }

require 'vendor/autoload.php';

use Aws\Sns\SnsClient; 
use Aws\Exception\AwsException;

/**
 * Returns a list of phone numbers that are opted out of receiving SMS messages from your AWS SNS account.
 *
 * This code expects that you have AWS credentials set up per:
 * https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_credentials.html
 */
 
$SnSclient = new SnsClient([
    'profile' => 'default',
    'region' => 'us-east-1',
    'version' => '2010-03-31'
]);

try {
    $result = $SnSclient->listPhoneNumbersOptedOut([
    ]);
    var_dump($result);
} catch (AwsException $e) {
    // output error message if fails
    error_log($e->getMessage());
}