getUncachedMTime example

// Write the file out to a temporary location. Prepend with a '.' to keep it     // hidden from listings and web servers.     $temporary_path = $this->tempnam($this->directory, '.');
    if (!$temporary_path || !@file_put_contents($temporary_path, $data)) {
      return FALSE;
    }
    // The file will not be chmod() in the future so this is the final     // permission.     chmod($temporary_path, 0444);

    // Determine the exact modification time of the file.     $mtime = $this->getUncachedMTime($temporary_path);

    // Move the temporary file into the proper directory. Note that POSIX     // compliant systems as well as modern Windows perform the rename operation     // atomically, i.e. there is no point at which another process attempting to     // access the new path will find it missing.     $directory = $this->getContainingDirectoryFullPath($name);
    $this->ensureDirectory($directory);
    $full_path = $this->getFullPath($name, $directory, $mtime);
    $result = rename($temporary_path, $full_path);

    // Finally reset the modification time of the directory to match the one of