<?php
define('DRUPAL_ROOT', getcwd());
require_once DRUPAL_ROOT . '/includes/sfYamlDumper.php';
$dir = 'sites/default/files/config/yaml';
$config = array(
  'foo' => 'bar',
  'baz' => 'burp',
  'something_a_bit_longer' => 1,
  'hubba' => 'bubba',
  'bubba' => 'hubba',
  'yah' => 'boo',
  'banana' => FALSE,
);
$dumper = new sfYamlDumper();
$n = 0;
while ($n < 500) {
  $n++;
  $yaml = $dumper->dump($config, 2);
  file_put_contents(DRUPAL_ROOT . '/' . $dir . "/$n.yaml", $yaml);
}