Snippit to parse Pantheon environment config

pantheon.settings.php

<?php
  // Place this in settings.php if you need to load Pantheon config earlier.
  // For instance, when using the domain access module.
  global $is_https;
  $is_https = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on';

  // Load environmental config, if present.
  if (isset($_SERVER['PRESSFLOW_SETTINGS'])) {
    $pressflow_settings = json_decode($_SERVER['PRESSFLOW_SETTINGS'], TRUE);
    foreach ($pressflow_settings as $key => $value) {
      // One level of depth should be enough for $conf and $database.
      if ($key == 'conf') {
        foreach($value as $conf_key => $conf_value) {
          $conf[$conf_key] = $conf_value;
        }
      }
      else {
        $$key = $value;
      }
    }
  }