Display month along with its year

I have an array like so:

1 => array:7 [▼
  "id" => "4"
  "order_code" => "BS-ORD-000000004"
  "order_type" => "Mixed - Subscription"
  "subscription_months" => "4"
  "subscription_start_month" => Carbon {#714 ▼
    +"date": "2016-11-05 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "subscription_end_month" => Carbon {#723 ▼
    +"date": "2017-03-04 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "monthName" => "November"
]
2 => array:7 [▼
  "id" => "4"
  "order_code" => "BS-ORD-000000004"
  "order_type" => "Mixed - Subscription"
  "subscription_months" => "4"
  "subscription_start_month" => Carbon {#721 ▼
    +"date": "2016-11-05 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "subscription_end_month" => Carbon {#717 ▼
    +"date": "2017-03-04 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "monthName" => "December"
]
3 => array:7 [▼
  "id" => "4"
  "order_code" => "BS-ORD-000000004"
  "order_type" => "Mixed - Subscription"
  "subscription_months" => "4"
  "subscription_start_month" => Carbon {#729 ▼
    +"date": "2016-11-05 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "subscription_end_month" => Carbon {#730 ▼
    +"date": "2017-03-04 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "monthName" => "January"
]
4 => array:7 [▼
  "id" => "4"
  "order_code" => "BS-ORD-000000004"
  "order_type" => "Mixed - Subscription"
  "subscription_months" => "4"
  "subscription_start_month" => Carbon {#732 ▼
    +"date": "2016-11-05 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "subscription_end_month" => Carbon {#733 ▼
    +"date": "2017-03-04 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "monthName" => "February"
]

Now what I want is to append a year to the monthName key after adding the months from subscription_start_month key.

Example of what I want:

2 => array:7 [▼
  "id" => "4"
  "order_code" => "BS-ORD-000000004"
  "order_type" => "Mixed - Subscription"
  "subscription_months" => "4"
  "subscription_start_month" => Carbon {#721 ▼
    +"date": "2016-11-05 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "subscription_end_month" => Carbon {#717 ▼
    +"date": "2017-03-04 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "monthName" => "December, 2016" // <-- The current year
]
3 => array:7 [▼
  "id" => "4"
  "order_code" => "BS-ORD-000000004"
  "order_type" => "Mixed - Subscription"
  "subscription_months" => "4"
  "subscription_start_month" => Carbon {#729 ▼
    +"date": "2016-11-05 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "subscription_end_month" => Carbon {#730 ▼
    +"date": "2017-03-04 00:00:00.000000"
    +"timezone_type": 3
    +"timezone": "UTC"
  }
  "monthName" => "January, 2017" // <-- The next year
]

I have the tried the following code, but it does not work as expected.

$startMonthForMixed = $invoice->subscription_start_date->month;

for($i = 0; $i < $invoice->subscription_months; $i++) {
    $convertedInvoices[] = [
        'id' => $invoice->id,
        'order_code'               => $invoice->order_code,
        'order_type'               => 'Mixed - Subscription',
        'subscription_months'      => $invoice->subscription_months,
        'subscription_start_month' => $invoice->subscription_start_date,
        'subscription_end_month'   => $invoice->subscription_end_date,
        'monthName'                => date("F", mktime(0, 0, 0, $startMonthForMixed, 01)) . ", " . Carbon::now()->addYear()
     ];
     $startMonthForMixed++;
 }

How can I achieve that ? Kindly help me out..

via Chebli Mohamed