Send SMS using AWS SNS via AWS PHP SDK

sms.php

use Aws\Sns\SnsClient;

$sns = \Aws\Sns\SnsClient::factory(array(
    'credentials' => [
        'key'    => '<access_key>',
        'secret' => '<access_secret>',
    ],
    'region' => '<region>',
    'version'  => 'latest',
));

$result = $sns->publish([
    'Message' => '<message>', // REQUIRED
    'MessageAttributes' => [
        'AWS.SNS.SMS.SenderID' => [
            'DataType' => 'String', // REQUIRED
            'StringValue' => '<sender_id>'
        ],
        'AWS.SNS.SMS.SMSType' => [
            'DataType' => 'String', // REQUIRED
            'StringValue' => 'Transactional' // or 'Promotional'
        ]
    ],
    'PhoneNumber' => '<phone_number>',
]);
print_r($result);