ReduceMultipleDefaultSwitchRector

Remove first default switch, that is ignored

 switch ($expr) {
     default:
-         echo "Hello World";
-
-    default:
          echo "Goodbye Moon!";
          break;
 }

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Php70\Rector\Switch_\ReduceMultipleDefaultSwitchRector;

return RectorConfig::configure()
    ->withRules([
        ReduceMultipleDefaultSwitchRector::class,
    ]);
SETS:  PHP 7.0