Directory tree array

directory-tree-array.php

<?php
/**
 * Creates a tree-structured array of directories and files from a given root folder.
 *
 * Gleaned from: http://stackoverflow.com/questions/952263/deep-recursive-array-of-directory-structure-in-php
 *
 * @param string $dir
 * @param string $regex
 * @param boolean $ignoreEmpty Do not add empty directories to the tree
 * @return array
 */
function dirtree($dir, $regex='', $ignoreEmpty=false)
{
    if (!$dir instanceof DirectoryIterator) {
        $dir = new DirectoryIterator((string)$dir);
    }
    $dirs  = array();
    $files = array();
    foreach ($dir as $node) {
        if ($node->isDir() && !$node->isDot()) {
            $tree = dirtree($node->getPathname(), $regex, $ignoreEmpty);
            if (!$ignoreEmpty || count($tree)) {
                $dirs[$node->getFilename()] = $tree;
            }
        } elseif ($node->isFile()) {
            $name = $node->getFilename();
            if ('' == $regex || preg_match($regex, $name)) {
                $files[] = $name;
            }
        }
    }
    asort($dirs);
    sort($files);

    return $dirs + $files;
}