Uploading data from excel to MySQL DB with Laravel and Maatwebsite\Excel

I am working on a application, in which the users can extract data from excel file to MySQL DB. The application will check every row of ID collunm from excel file with content_id table of the database. If any ID matches any record of DB, then the row will update. Otherwise it will create a new record in DB. This is the code of my function in controller:

public function upload(Request $request)
{

    if($request->hasFile('excel')){
        Excel::load($request->file('excel')->getRealPath(), function ($reader) {
            foreach ($reader->toArray() as $key => $row) {
                foreach ($row as $record => $info){
                    if ($content = Content::find($info['id'])) {
                        $content->views()->save($info['views']);
                    }
                    else{
                        $content = new Content();
                        $content->title = $info['title'];
                        $content->content_id = $info['id'];
                        //$content->views()->save($info['views']);
                        $content->save();
                    }
                }
            }
        });
    }


    return redirect()->back();

}

But it shows error as like below:

I have tried to find the error by using dd() and print_r(). But cannot find what is the problem. Along with this, I am also confused about the quality of my code as I am using foreach loop in another foreach loop. So, does anyone have any solution? Thanks in advance. I am using Maatwebsite\Excel to handle excel import/export etc.

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