[PHP] 计算文件夹大小 Determining the Size of a Directory’s Contents

The code as below :

<?php
   function directory_size($directory) {
       $directorySize=0;
       /* Open the directory and read its contents. */
       if ($dh = @opendir($directory)) {
          /* Iterate through each directory entry. */
          while (($filename = readdir ($dh))) {
             /* Filter out some of the unwanted directory entries. */
             if ($filename != "." && $filename != "..")
             {
                // File, so determine size and add to total.
                if (is_file($directory."/".$filename))
                   $directorySize += filesize($directory."/".$filename);
                   // New directory, so initiate recursion. */
                   if (is_dir($directory."/".$filename))
                      $directorySize += directory_size($directory."/".$filename);
             }
         } #endWHILE
      } #endIF
      @closedir($dh);
      return $directorySize;
   } #end directory_size()
?>