AWS SDK for PHP ver.2.5 config.php

config.php

<?php return array(
    'includes' => array('_aws'),
    'services' => array(
        'default_settings' => array(
            'params' => array(
                'key'    => 'AAAAAAAAAAAAAAAAAAAA',
                'secret' => 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAA',
                'region' => 'ap-northeast-1'
            )
        ),
        's3' => array(
        'alias'   => 'S3',
        'extends' => 'default_settings',
        'class'   => 'Aws\S3\S3Client'
        )
    )
);

ドキュメントルートの上の階層など任意のディレクトリに設置する