Value of $total not being set inside lumen collection map function

Question

I have a lumen collection object for my order and use map function to iterate over it and do some logic. I also need the total value of the order which is calculated using quantity * price. But the variable that is responsible for holding the total value is always 0.

$total = 0; $items = Cart_Item::where('user_id', $user->id)->get(); $items = $items->map(function ($item, $key) use ($order, $total) { $product = Product::where('id', $item->product_id)->first(); $order_item = new Order_Item(); $order_item->order_id = $order->id; $order_item->product_id = $item->product_id; $order_item->quantity = $item->quantity; $order_item->price = $product->GetPrice->price; $order_item->save(); $total = $total + ($order_item->quantity * $order_item->price); });

No matter what I do, the $total always returns 0.

Unamata Sanatarai · Accepted Answer · 2017-03-21 11:36:41Z

The scope of your closure is not that of the entire file, but it's limited only to what's between the {} tags.

The used variables are copied into the function scope.

One solution would be to make $total a global variable:

$total = 0; $items = Cart_Item::where('user_id', $user->id)->get(); $items = $items->map(function ($item, $key) use ($order, $total) { $product = Product::where('id', $item->product_id)->first(); $order_item = new Order_Item(); $order_item->order_id = $order->id; $order_item->product_id = $item->product_id; $order_item->quantity = $item->quantity; $order_item->price = $product->GetPrice->price; $order_item->save(); global $total; $total = $total + ($order_item->quantity * $order_item->price); });

Another is to pass global as a reference &$total like so:

$total = 0; $items = Cart_Item::where('user_id', $user->id)->get(); $items = $items->map(function ($item, $key) use ($order, &$total) { $product = Product::where('id', $item->product_id)->first(); $order_item = new Order_Item(); $order_item->order_id = $order->id; $order_item->product_id = $item->product_id; $order_item->quantity = $item->quantity; $order_item->price = $product->GetPrice->price; $order_item->save(); $total = $total + ($order_item->quantity * $order_item->price); });

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