Display an array in a readable format, preserving the whitespace, formatting as code, and displaying inside of a Message box.

Drupal Display Array

<?php

/**
 * Display an array in a readable format, preserving the whitespace,
 * formatting as code, and displaying inside of a Message box. This can
 * be placed inside of any function within a Drupal module or theme.
 * This is primarily used during troubleshooting and should never be
 * used on a production website.
 *
 * @param $array
 * Represents array to be displayed, this could be a node object for instance
 */
drupal_set_message('<code><pre>' . print_r($array, TRUE) . '</pre></code>');