Where is the variable overwritten?

Question

PHP

Hello.
There is this code:

case 'order':
        $orderObj = new orderHandler($first_name, $last_name, $phone, $adress, $email, $message, $order);
        $msg = "Имя: {$orderObj->getFirstName()} <br>";
        $msg .= "Телефон: {$orderObj->getPhone()} <br>";
        $msg .= "Заказ: {$orderObj->getOrder(false)} <br>";
        $msg .= "Адрес: {$orderObj->getAdress()} <br>";
        break;
}

$arOrder = [
    'order' => $orderObj->getOrder(false),
];

And there is a method:

public function getOrder($toString){
            $order_string = $this->order;
        if($toString){
            $ar = array();
            foreach($order_string as $item){
                if($item == ''){
                    unset($item);
                }
                else{
                    $ar[] = $item;
                }
            }
            $order_string = implode(',', $ar);
            return $order_string;
        }else{
            return $this->order;
        }

    }

The bottom line is this: if I call the $orderObj->getOrder(false) method once, then everything works as it should - at the output I have either a cleaned array or a string, as many times as I like.
But it's worth calling somewhere else, so the mess begins - then the notice will come out that I'm trying to translate the array into a string, then vice versa.
Actually, in any case, you will need 2 outputs - one for the message, and the other for sending to the order processing panel, poke my nose into what I'm doing wrong
ps I introduced a bunch of variables in the method, I thought that I was overwriting it by directly accessing the property, but what - didn't work

Answer 1

You have an orderHandler object in it, apparently (you did not provide the code of the entire class) there is a public variable order. On the first call it is an array, on the second it is a string. What is there specifically - xs. Give the whole code, or create a new instance of the object each time you access it.

Answer 2

VAR_DUMP in your hands and go ahead, in this section of the code a lot of things happen "behind the scenes", until you find out where the value has changed, pointing your finger in different directions is useless.