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);  }?>