PHP - Date Function

Question

I created this date function to show the date, day and month.

The problem is that it shows the més in English..

exemplo: March, 10, 2018".

How do I make him read in Portuguese?

function dateName($date) {

    $result = "";

    $convert_date = strtotime($date);
    $month = date('F',$convert_date);
    $year = date('Y',$convert_date);
    $name_day = date('l',$convert_date);
    $day = date('j',$convert_date);


    $result = $month . " " . $day . ", " . $year;

    return $result;
}