Laravel Undefined Property Error with Google Pagespeed API

i'm a beginner in using laravel. For my webapp I want to use the Google API PageSpeed. When visiting /pagespeed, it gives me this error: ErrorException (E_NOTICE) Undefined property: stdClass::$ruleScore

Also i'm not sure if i made a correct return. I just want to show the meassured data on the /pagespeed page.

Couldn't really find an answer for my problem, I hope you can help.

I used the pagespeed.php code from http://ift.tt/2zFJnmU and put this in my PagespeedController:

 public function pageSpeed(){
    $url = 'http://ift.tt/g8FRpY';
    $key = 'my API key';
    // View http://ift.tt/2hpTMbZ to get a key
    $data = json_decode(file_get_contents("http://ift.tt/2zEtcpD"));
    $dat = $data->formattedResults->ruleResults;
    foreach($dat as $d) {
      $name = $d->localizedRuleName;
      $score = $d->ruleScore;
      print "\nTest: " . $name . "\n";
      print "Score: " . $score . "\n";
      if ($score != 100) {
        if (isset($d->urlBlocks[0]->header->args)) {
          $advice_header = replace_placeholders($d->urlBlocks[0]->header->format, $d->urlBlocks[0]->header->args);
        }
        else {
          $advice_header = $d->urlBlocks[0]->header->format;
        }
        print "Advice: " . $advice_header . "\n";
        foreach ($d->urlBlocks[0]->urls as $url) {
          $advice = replace_placeholders($url->result->format, $url->result->args);
          print $advice . "\n";
        }
      }
    };
    function replace_placeholders($format, $args) {
      $i = 1;
      foreach ($args as $arg) {
        $format = str_replace("\$" . $i, "$arg->value", $format);
        $i++;
      }
      return view('pagespeed')->with('format');
    }

This is in my views folder: pagespeed.blade.php:

@extends('layouts.app')
@section('content')
<h1>Page Speed</h1>
@endsection

This is my Route in web.php:

Route::get('/pagespeed', 'PagespeedController@pageSpeed');

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