php list output images in a directory

1<?php
2
3echo scanDirectoryImages("uploads");
4
5/**
6* Recursively search through directory for images and display them
7* 
8* @param  array  $exts
9* @param  string $directory
10* @return string
11*/
12function scanDirectoryImages($directory, array $exts = array('jpeg', 'jpg', 'gif', 'png'))
13{
14if (substr($directory, -1) == '/') {
15    $directory = substr($directory, 0, -1);
16}
17$html = '';
18if (
19    is_readable($directory)
20    && (file_exists($directory) || is_dir($directory))
21) {
22    $directoryList = opendir($directory);
23    while($file = readdir($directoryList)) {
24        if ($file != '.' && $file != '..') {
25            $path = $directory . '/' . $file;
26            if (is_readable($path)) {
27                if (is_dir($path)) {
28                    return scanDirectoryImages($path, $exts);
29                }
30                if (
31                    is_file($path)
32                    && in_array(end(explode('.', end(explode('/', $path)))),   $exts)
33                ) {
34                    $html .= '<a href="' . $path . '"><img src="' . $path
35                        . '" style="max-height:100px;max-width:100px" />  </a>';
36                }
37            }
38        }
39    }
40    closedir($directoryList);
41}
42return $html;
43}