Undefined Variable even if I passed it already

Question

I'm getting Undefined Variable error. Here is my controller:

Controller:

public function index()
{

    /**$englishgrades = StudentHistory::select('date', 'student_id', 'grade')
    ->where('subject', 'English')
    ->groupBy('student_id')
    ->orderBy('date','desc')
    ->first()
    ->get();        
    */  

    $englishgrades = StudentHistory::where('subject', 'English')
    ->get();        

    $englishgrades = [];

    return view('home', $englishgrades);
}

I'm calling it to my blade using

{{ $englishgrades }}

Undefined variable: englishgrades (View: /home/vagrant/Code/projects/DYK/resources/views/home.blade.php)

Answer 1

you should use compact

$englishgrades = StudentHistory::where('subject', 'English')
->get();
$englishgrades = []; // remove this so it will not overwrite the above declaration ..
return view('home', compact('englishgrades'));

it will return an empty array since you're overwriting the original value ..

Answer 2

Remove your

$englishgrades = []; 

and

return view('home', ['englishgrades' => $englishgrades]);

Answer 3

return view('home', $englishgrades);

in above code second Argument is need to be a array key as a variable name and value as variable or value.

like

   return view('home',['englishgrades'=>$englishgrades]);

you can write by hand or use compact function to generate a array() of key value pair

  return view('home',compact('englishgrades'));

So Now you access a $englishgrades in a View

or you can use like

   $data = compact('englishgrades'); or 
   $data = ['englishgrades'=>$englishgrades];
   return view('home',$data);

here main thing is In View you use key as a variable ex:

 $data = ['grades'=>$englishgrades];
   return view('home',$data);

So in View you have to use $grades