Convert array of objects to array of values in Laravel

Question

I have below code in my laravel application controller:

$levels =  $request->level;
return $levels;

and it returns like this:

{
  1: [
    "9226"
  ],
  2: [
    "166"
  ]
}

which I need is return just values (9226,166) as array like below:

{
  "9226",
  "166"
}

How to get just values?

Answer 1

if array then you can use array_flatten()

array_flatten($levels)

if it is collection then

$ar = $levels->flatten();
$ar->all();  // get array