Array store in array with duplicate form

i am making a duplicate of form using close in that form i have checkbox , for a single form i am passing an array and i can easily store that like this implode(',', $checkedValuesArray); but when i make duplicate of form how can i store that 2 forms data in array? Here is my controller code

        $customInputName = $request->input('customInputName');
        $inputType = $request->input('inputType');
        $checkedValues = $request->input('checkedValues');

        $customInputNameArray = json_decode($customInputName);
        $inputTypeArray = json_decode($inputType);
        $checkedValuesArray = json_decode($checkedValues);
        $test = implode(',', $checkedValuesArray);
        dd($test);
        for ($i = 0; $i < count($customInputNameArray); $i++) {
            $customInput = new inputForm();
            $customInput->customInputName = $customInputNameArray[$i];
            $customInput->inputType = $inputTypeArray[$i];
            $customInput->validation = $test[$i];
            $customInput->eventid = $eventId;
            $customInput->save();
        } ```