<?php

/**
 * Convert a multi-dimensional array into a single-dimensional array.
 * @author Sean Cannon, LitmusBox.com | seanc@litmusbox.com
 * @param  array $array The multi-dimensional array.
 * @return array
 */
function array_flatten($array) {
  if (!is_array($array)) {
    return false;
  }
  $result = array();
  foreach ($array as $key => $value) {
    if (is_array($value)) {
      $result = array_merge($result, array_flatten($value));
    } else {
      $result[$key] = $value;
    }
  }
  return $result;
}