I added a vardump here:

        $elements = explode('.', $parts[2]);
        var_dump($elements);
        exit;

and this is what it dumped:

$ php exercise/console programs:send-daily-emails
array(3) {
  [0]=>
  string(11) "daily-email"
  [1]=>
  string(4) "html"
  [2]=>
  string(4) "twig"
}

-- 
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