code: public static function setPermission(array $paths)
      {
          foreach ($paths as $path => $permission) {
              echo "chmod('$path', $permission)...";
              if (is_dir($path) || is_file($path)) {
                  chmod($path, octdec($permission));
                  echo "done.\n";
              } else {
                  echo "file not found.\n";
              }
          }
      }
docs: Sets the correct permission for the files and directories listed in the extra section.
  @param array $paths the paths (keys) and the corresponding permission octal strings (values)