Laravel check if Request has collection

I want to run an if statement over each of my posted requests and if any are a collection do something different.

When I die dump $request->all I have an array that looks like this;

  "_token" => "MMRFBAgyThsIHzITzT26Qwdp4L6HDV0JTPGs6h"
  "page_name" => "Travel"
  "heading" => "Travel Europe"
  "textarea" => "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostru ▶"
  "seo_title" => "travel"
  "seo_description" => "travel"
  "attribute_1" => "Food"
  "attribute_2" => "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor."
  "attribute_3" => "Hotels"
  "attribute_6" => "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor."
  "attribute_5" => "Events"
  "attribute_4" => "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor."
  "attribute_7" => null
  "attribute_8" => null
  "attribute_9" => UploadedFile {#233 ▶}

The data will be different so I can't write anything static e.g.$request->input('attribute_9')

This is how I'm currently handling the attributes which are the unknown requests.

$input = $request->all();

foreach($input as $key=>$value) {

    if(strstr($key,'attribute_')) {
        $i = str_replace("attribute_", "", $key);


        if (!empty($value)) {   
            if ($value instanceof Illuminate\Http\UploadedFile) {
                dd('lets have a collection...');
            }

            Attribute::where('id', $i)->update(['value' => $value]);
        } else{
            Attribute::where('id', $i)->update(['value' => '']);
        }

    }
}

You can see I've tried to check the $value using instanceOf but that hasn't worked. The if statement is never true and the page just returns.

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