将数据添加到数组PHP Laravel

I have an existing array named $list I want to add new field or data in that array but I dont know how to. I have this code

$list = DB::table('transaction_tickets')
   ->leftJoin('airlines','transaction_tickets.airline_id','=','airlines.id')
   ->select('transaction_tickets.*',....)
   ->get();


$inputs = array();
foreach ($list as $key => $value) {
    $inputs[$key] = $value;
}

Laravel 5 has a method to do this for you: pluck()

$inputs = $list->pluck($property);

For earlier versions of Laravel, you may have to use the lists() method instead

$inputs = $list->lists($property);

Eloquent get method returns a collection.

So you can add values to this collection.

Use $list->put('key', 'value') ;

docs