Flush cache in case of WSOD without Drush on shared host I have installed Drupal from using build-in scripts on runcloud.io, but I have noticed that Drush is not available. They have replied:


  Sorry, it is not possible to install drush into Runcloud. Because the
  installation leads to php crash as it will erase cerain php modules


I get used to using Drush, especially when Drupal 8 website encountered an unexpected error, without this option I don't see the way how to clear the cache without UI, restore from backup etc.

Are there any other options to rebuild caches without Drush to recover the website from an unexpected error?
I get used to using Drush, especially when Drupal 8 website
  encountered an unexpected error, without this option I don't see the
  way how to clear the cache without UI.


Run www.mysite.com/update.php. This clears the cache, even when no updates are to run.

If you don't have access set $settings['update_free_access'] = TRUE; temporarily in settings.php.