ini provider

Aws\Credentials\CredentialProvider::ini attempts to load credentials from the shared config and credentials files. By default, the SDK attempts to load the “default” profile from the shared Amazon credentials file located at ~/.aws/credentials. If the SDK finds the AWS_SDK_LOAD_NONDEFAULT_CONFIG environment variable, it also checks for a "default" profile in the shared Amazon config file located at ~/.aws/config.

use Aws\Credentials\CredentialProvider;
use Aws\S3\S3Client;

$provider = CredentialProvider::ini();
// Cache the results in a memoize function to avoid loading and parsing
// the ini file on every API operation
$provider = CredentialProvider::memoize($provider);

$client = new S3Client([
    'region'      => 'us-west-2',
    'version'     => '2006-03-01',
    'credentials' => $provider
]);

You can use a custom profile or .ini file location by providing arguments to the function that creates the provider.

$profile = 'production';
$path = '/full/path/to/credentials.ini';

$provider = CredentialProvider::ini($profile, $path);
$provider = CredentialProvider::memoize($provider);

$client = new S3Client([
    'region'      => 'us-west-2',
    'version'     => '2006-03-01',
    'credentials' => $provider
]);