php - Why does variable say undefined? -

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this says $total , $sub undefined $total += $sub. $sub declared in while loop , both $sub within function should local variable. why can't use it?

public function cart() {     foreach($_session $name=>$value){         if (substr($name, 0, 5) == 'cart_') {             if((int)$value > 0){                 $id = substr($name, 5, (strlen($name)-5));                  $st = $this->db->prepare("select id, name, price deals id=?");                 $st->bindparam(1, $id);                 $st->execute();                  while($cart_item = $st->fetch(pdo::fetch_obj)){                     $sub = $cart_item->price*$value;                     echo $cart_item->name.' x '.$value.' @ '.$cart_item->price.' = '.$sub.' <a href="cart.php?add='.$id.'">[+]</a> <a href="cart.php?remove='.$id.'">[-]</a> <a href="cart.php?delete='.$id.'">[delete]</a><br/>';                 }             }         }         $total += $sub;     }  }

the $total variable should initialized above foreach. $sub variable should initialized inside foreach, @ top.

$total = 0; foreach ($_session $name => $value) {     $sub = 0;     ...

also, can move $total += $sub; higher up, positioned below inner while loop.


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