Not able to get value from select element. (PHP/HTML) -

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i'm trying value of drop down menu. drop down menu created after user clicks button with undrafted players . however, when echo selectoptionud, not value. idea what's going on here?

<html> <body>     <?php  if (isset($_post['submitundrafted'])) {              $selectoptionud = $_post['filter_ud']; //undrafted selection               echo $selectoptionud;         }//end of submitundrafted   if (isset($_post['undrafted'])) {                     $menu= "<select name='filter_ud' id='filter_ud'>                             " . $options . " //i have erased previous code gets value of variable.                      </select>";                  echo $menu;                 ?>                 <form action="transfer.php" method="post">                 <input type="submit" name="submitundrafted" value="submit" />                 </form>                 <?php          } ?> <form action="transfer.php" method="post">      <input type="submit" name="undrafted" value="with undrafted players">                  </form> </body> </html>

here $options this

<option value="1">abc</option> <option value="2">bcd</option> <option value="3">def</option>       if (isset($_post['undrafted'])) {            $menu= "<select name='filter_ud' id='filter_ud'>                                     " . $options . " //i have erased previous code gets value of variable.                  </select>";      ?>      <form action="transfer.php" method="post">         <?php echo $menu;?>         <input type="submit" name="submitundrafted" value="submit" />      </form>      <?php       }?>

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