lynt-mo-cache.php

<?php
/**
 * Plugin Name: Lynt MO Cache
 * Description: Lynt translations performance booster EXPERIMENTAL
 * Plugin URI:  https://github.com/lynt-smitka/WP-nginx-config/blob/master/extras/mu-plugins/lynt-mo-cache.php
 * Author:      Vladimir Smitka
 * Author URI:  https://lynt.cz/
 * License:     GNU General Public License v3 or later
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('ABSPATH') or die('nothing here');

//reconstruction fake class
class Lynt_Translation_Entry extends Translation_Entry
{
  public static function __set_state($args)
  {
    return new Translation_Entry($args);
  }
}

function lynt_load_textdomain($retval, $domain, $mofile)
{
  global $l10n;
  if (!is_readable($mofile))
    return false;
  
  $cache_path = WP_CONTENT_DIR . "/cache/lynt";
  if (!file_exists($cache_path)) {
    mkdir($cache_path, 0770, true);
  }
  $cache_file = sprintf('%s/mo-%s.php',$cache_path, md5($mofile));
  
 
  if (file_exists($cache_file)) {
    include $cache_file;
    $data = isset($val) ? $val : false;
  } else {
    $data = false;
  }
  
  $mtime = filemtime($mofile);
  
  $mo = new MO();
  
  if (!$data || !isset($data['mtime']) || $mtime > $data['mtime']) {
    if (!$mo->import_from_file($mofile)) return false;
    // prepare structure
    $data = array(
      'mtime' => $mtime,
      'file' => $mofile,
      'entries' => $mo->entries,
      'headers' => $mo->headers
    );
    
    // export mo object
    $val = var_export($data, true);
    // replace the original class with reconstruction fake class
    $val = str_replace('Translation_Entry::', 'Lynt_Translation_Entry::', $val);
    // save to file
    file_put_contents($cache_file, '<?php $val = ' . $val . ';', LOCK_EX);
    
  } else {
    $mo->entries = $data['entries'];
    $mo->headers = $data['headers'];
  }
  if (isset($l10n[$domain])) {
    $mo->merge_with($l10n[$domain]);
  }
  $l10n[$domain] = &$mo;
  return true;
}

add_filter('override_load_textdomain', 'lynt_load_textdomain', 0, 3);