Upgrading plugins to work with 1.5.8/PHP 8.0+

Array Based Language Files

To avoid duplicate define notices from PHP, Zen Cart 1.5.8 uses Array Based Language Files.

If you need to include a language file, the old style of doing so

  $langfile = DIR_WS_LANGUAGES . $_SESSION['language'] . "/modules/order_total/" .  "ot_group_pricing.php";
  include_once ($langfile);

will no longer work for 1.5.8 and above. However, plugin authors may want to make their code compatible with both 1.5.7 and 1.5.8. Here’s one approach:

  $filename = "ot_group_pricing.php"; 
  $old_langfile = DIR_WS_LANGUAGES . $_SESSION['language'] . "/modules/order_total/" .  $filename; 
  $new_langfile = DIR_WS_LANGUAGES . $_SESSION['language'] . "/modules/order_total/" .  "lang." . $filename; 
  if (file_exists($old_langfile)) {
          include_once ($old_langfile);
  } else if (file_exists($new_langfile)) {
     global $languageLoader; 
     $folder = "/modules/order_total/"; 
     $languageLoader->loadExtraLanguageFiles(DIR_FS_CATALOG . DIR_WS_LANGUAGES,  $_SESSION['language'], $filename, $folder);
  }

Creating Definitions