Code Snippet: Revert all overridden views 

<?php
$views = views_get_all_views();
 
foreach ($views as $view) {
  if ($view->disabled) continue;
 
  if ($view->type == t('Overridden')) {
    $view->delete();
    views_object_cache_clear('view', $view->name);
  }
}
?>

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