AWS Cross Account PHP Script

AWSCrossAccount.php

<?php
require 'vendor/autoload.php';

$credentials = new Aws\Credentials\Credentials('x', 'x');

$sts = new Aws\Sts\StsClient([
    'version'     => 'latest',
    'region'      => 'us-east-1',
    'credentials' => $credentials
]);

$credentials_result = $sts->assumeRole([
    'RoleArn' => 'arn:aws:iam::066600000000:role/xxxxxxx',
    'RoleSessionName' => 'newsession',
    'DurationSeconds' => 43200
])['Credentials'];

$credentials = new Aws\Credentials\Credentials($credentials_result['AccessKeyId'], $credentials_result['SecretAccessKey'], $credentials_result['SessionToken']);

$s3 = new Aws\S3\S3Client([
    'version'     => 'latest',
    'region'      => 'us-east-1',
    'credentials' => $credentials
]);

$buckets = $s3->listBuckets();

foreach ($buckets['Buckets'] as $bucket) {
    echo $bucket['Name'] . "\n";
}