get information about directories

dir_stat.php

<?php

$cache_expiration = 3600; // 1 hour

$cache_file = '/path/to/cache/file.json';

if (file_exists($cache_file) && (time() - $cache_expiration < filemtime($cache_file))) {
  header('Content-Type: application/json');
  readfile($cache_file);
  exit;
}

header('Content-Type: application/json');

$directories = array(
  "safe" => "/home/safe/data",
  "server" => "/home/sss/uploads"
);

$results = array();

foreach ($directories as $label => $dir) {
  $file_count = 0;
  $size = 0;

  $handle = opendir($dir);

  if ($handle) {
    while (false !== ($entry = readdir($handle))) {
      if (is_file($dir . '/' . $entry)) {
        $file_count++;
        $size += filesize($dir . '/' . $entry);
      }
    }
  }

  closedir($handle);

  $size_mb = round($size / (1024 * 1024), 2);

  $results[$label] = array(
    "file_count" => $file_count,
    "size_mb" => $size_mb,
    "size" => $size
  );
}

file_put_contents($cache_file, json_encode($results));

echo json_encode($results);
?>