Generate a CSV and provide it for download with a response in Laravel 5

csv_generate.php

<?php
    public function export()
    {
        $headers = [
            'Content-type' => 'text/csv',
            'Content-Disposition' => 'attachment; filename=users.csv',
            'Pragma' => 'no-cache',
            'Cache-Control' => 'must-revalidate, post-check=0, pre-check=0',
            'Expires' => '0'
        ];
    
        $users = User::all();

        $columns = [
            'UserID',
            'Name',
            'Email',
            'StripeID',
            'TrialEndsAt',
            'Verified',
            'Banned',
            'Disabled',
            'Created',
            'RenewWarning'
        ];
    
        $callback = function () use ($users, $columns) {
            $this->generateCsv($users, $columns);
        };

        return Response::stream($callback, 200, $headers);
    }

    protected function generateCsv($users, $columns)
    {
        $file = fopen('php://output', 'w');
            
        fputcsv($file, $columns);

        foreach ($users as $user) {
            fputcsv($file, [
                $user->id,
                $user->name,
                $user->email,
                $user->stripe_id,
                $user->trial_ends_at,
                $user->verified,
                $user->banned,
                $user->disabled,
                $user->created,
                $user->renew_warning
            ]);
        }

        fclose($file);
    }