PHP对文件夹递归执行chmod命令的方法

<?php
  function recursiveChmod($path, $filePerm=0644, $dirPerm=0755)
  {
   // Check if the path exists
   if(!file_exists($path))
   {
     return(FALSE);
   }
   // See whether this is a file
   if(is_file($path))
   {
     // Chmod the file with our given filepermissions
     chmod($path, $filePerm);
   // If this is a directory...
   } elseif(is_dir($path)) {
     // Then get an array of the contents
     $foldersAndFiles = scandir($path);
     // Remove "." and ".." from the list
     $entries = array_slice($foldersAndFiles, 2);
     // Parse every result...
     foreach($entries as $entry)
     {
      // And call this function again recursively, with the same permissions
      recursiveChmod($path."/".$entry, $filePerm, $dirPerm);
     }
     // When we are done with the contents of the directory, we chmod the directory itself
     chmod($path, $dirPerm);
   }
   // Everything seemed to work out well, return TRUE
   return(TRUE);
  }
?>