What's wrong with my if statement in this code

the if condition of the method empty isn't echoing, I also tried to replace empty() by count($topping==0)... Any thoughts.

<?php
      if ($_POST) 
      {
          $topping = $_POST[topping];
          if(empty($topping)) 
          {
            echo "You didn't select any Toppings. Booo!";
          } 
        else
        {

        if(count($topping) == 1)
        {
          echo "Your order is a sandae with " . $topping[0];
        }
        elseif (count($topping) == 2) {

          echo "Your order is a sandae with " . $topping[0] . " and ". $topping[1];
        }
         else {
            $ch =  "Your order is a sandae with " . $topping[0];
            for ($i=1; $i < count($topping)-1 ; $i++) { 
              $ch = $ch . ", " . $topping[$i] ;
            }
            echo $ch . " and " . $topping[count($topping)-1];
        }
        }