How to group array values ​​into a variable?

Question

PHP

How to group the values ​​of the array into one variable from this array, in the end I want to get 1,2,3.

$this->allInput = $request->all();
    $arrIDsOrder = [];
    $ordersInput = $this->allInput['orders'];
    foreach ($ordersInput as $item) {
        $arrIDsOrder[] = $item['id'];
        $this->allArray = $item['id'];
    }
    dump($arrIDsOrder);

Answer 1

If we are talking about transforming an array into a variable, there is an implode

$array = array('имя', 'почта', 'телефон');
$comma_separated = implode(",", $array);

or

$this->allInput = $request->all();

    $string = implode(",", $this->allInput['orders']);