gistfile1.php

<?php
require_once 'Zend/Loader/Autoloader.php';

Zend_Loader_Autoloader::getInstance();

$response             = array();
$jsonResponse         = '';
$gallery              = '';
$galleryImages        = array();
$galleryDirectories   = array();
$galleryRoot          = "./gallery";
$pathToSmallImages    = '';
$pathToMediumImages   = '';
$pathToLargeImages    = '';
$pathToThumbnailImage = '';

$queryParamFilterChain = new Zend_Filter();
$queryParamFilterChain->addFilter(new Zend_Filter_HtmlEntities())
                      ->addFilter(new Zend_Filter_StripTags());

$gallery              = $queryParamFilterChain->filter($_GET['gallery']);
$pathToSmallImages    = "{$galleryRoot}/{$gallery}/small";
$pathToMediumImages   = "{$galleryRoot}/{$gallery}/medium";
$pathToLargeImages    = "{$galleryRoot}/{$gallery}/large";
$pathToThumbnailImage = "{$galleryRoot}/{$gallery}/thumb";

function compareFileName($a, $b) {
  return strnatcmp($a['name'], $b['name']);
}

foreach (new DirectoryIterator(realpath($galleryRoot)) as $info) {

  if ($info->isDot()) { continue; }

  if ($info->isDir()) {
    $dirs[] = $info->getFilename();
  }
}

if (in_array($gallery, $dirs)) {

  $it = new DirectoryIterator(realpath($pathToThumbnailImage));

  foreach ($it as $info) {

    if ($info->isDot()) { continue; }

      if ($info->isFile()) {

        $width   = 0;
        $height  = 0;
  
        $imgSize = getimagesize('/full/system/path/'.$pathToMediumImages.'/'.$info->getFilename());
  
        $width   = $imgSize[0];
        $height  = $imgSize[1];
  
        $galleryImages[] = array('name' => $info->getFilename(), 'width' => $width, 'height' => $height);
      }
  }
  
  usort($galleryImages, 'compareFileName');
  
  $response = array('total'         => count($galleryImages), 
                    'thumbnailPath' => $pathToThumbnailImage,
                    'smallPath'     => $pathToSmallImages,
                    'mediumPath'    => $pathToMediumImages,
                    'largePath'     => $pathToLargeImages,
                    'images'        => $galleryImages);

} else {
  $response = array('total' => '0');
}

header('Content-type: application/json; charset=utf-8');

print Zend_Json::encode($response);