<?php

define('DRUPAL_ROOT', getcwd());
require_once DRUPAL_ROOT . '/core/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_CODE);

use Drupal\Core\Config\FileStorage;
$s = new FileStorage("/tmp");

$dumpData = array(
  'a string' => 'hello world',
  'an int' => 42,
  'a float' => 3.14159,
  'a boolean' => TRUE,
  'null' => NULL,
  'map' => array(
    'key' => 'value',
  ),
  'array' => array(1,2,3),
);

$s->write('test', $dumpData);
$readData = $s->read('test');

assert($dumpData == $readData);

print("YAML:\n");
var_dump(file_get_contents("/tmp/test.yml"));
print("parsed:\n");
var_dump($readData);