Prints out a table with all the directories on a web server. Good for chasing down large files during a cleanup. Bytes column is for easy sorting in excel if needed. If you have a lot of files it will be slow.

size-of-all-directories.php

<?php
  $root = '.';
  $min_size = 10485760; 
  /* in bytes. 
  1 mb   = 1048576
  10 mb  = 10485760
  100 mb = 104857600
  1 gb   = 1048576000
  */

  $iter = new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($root, RecursiveDirectoryIterator::SKIP_DOTS), 
            RecursiveIteratorIterator::SELF_FIRST, 
            RecursiveIteratorIterator::CATCH_GET_CHILD // Ignore "Permission denied"
          );

  $paths = array(
      $root
  );

  echo "Minimum File Size: ". format_size($min_size) ."<br>";
  ?>
  <table border="1">
  <tr><th>Bytes</th><th>Size</th><th>Directory</th></tr>
  <?php
  foreach ($iter as $path => $dir) {
      if ($dir->isDir()) {
          $dir_size = get_dir_size($path);
          if($dir_size>$min_size){
            $folders[$dir_size] = "<tr><td>$dir_size</td><td>" . format_size($dir_size) . "</td><td>$path</td></tr>\n";
          }
      }
  }

  krsort($folders);

  foreach ($folders as $folder) {
      echo $folder;
  }

  function get_dir_size($directory) {
      $size = 0;
      foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory)) as $file) {
          $size += $file->getSize();
      }
      return $size;
  }

  function format_size($size) {//https://stackoverflow.com/posts/2510459/revisions
      if ($size >= 1) {
          $si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB' );
          $base      = 1024;
          $class     = min((int) log($size, $base), count($si_prefix) - 1);
          return (sprintf('%1.2f', $size / pow($base, $class)) . $si_prefix[$class]);
      } else {
          return (0);
      }
  }
?>
</table>