echo specific category laravel 5

I intend to rely on such database Developer how many categories there and give me a value. I can do but doing echo in my index page he retorname the value 2 because there is a Developer and Design. I intend it to me just one because I want to make an echo so the Developer. My code is as follows

Index

<?php echo $portfolio['Developer']; ?>

Controller

    $portfolio = DB::table('portfolio')->where('portfolio.category','=','Developer')
                                       ->orWhere('portfolio.category','=','Design')
                                       ->count();
    return view('backend/dashboard.index', [
        'portfolio' => $portfolio, 
    ]); 

via Chebli Mohamed