How to rewrite this php more efficiently [closed]

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I need to display manual/automatic transmission vehicle information, and the best I can come up with is the following code. I think its wrong and inefficient, but I can't quite put my finger on it.

<?php
if ($obj->AutoTrans == 'S'):
  echo "Automatic";
  if ($obj->ManualTrans == 'O'):
    echo " (Manual Optional)";
  endif;                   
elseif($obj->ManualTrans == 'S'):
  echo "Manual";
  if ($obj->AutoTrans == 'O'):
    echo " (Automatic Optional)";
  endif;     
endif;                  
?>

---

if ($obj->AutoTrans == 'S')
    echo "Automatic".($this->ManualTrans=='O'?' (Manual Optional)':'');

if ($obj->ManualTrans == 'S')
    echo "Manual".($this->AutoTrans=='O'?' (Automatic Optional)':'');

---

There's nothing inefficient about this method. You could write it cleaner (in my opinion) by using curly braces instead of using block syntax, though.