invoiceninja/app/Ninja/Repositories/ReferralRepository.php

<?php namespace App\Ninja\Repositories;

use DB;
use Utils;

class ReferralRepository
{
    public function getCounts($userId)
    {
        $accounts = DB::table('accounts')
                        ->where('referral_user_id', $userId)
                        ->get(['id', 'pro_plan_paid']);

        $counts = [
            'free' => 0,
            'pro' => 0,
            'enterprise' => 0
        ];

        foreach ($accounts as $account) {
            $counts['free']++;
            if ($account->isPro()) {
                $counts['pro']++;
                if ($account->isEnterprise()) {
                    $counts['enterprise']++;
                }
            }
        }

        return $counts;
    }



}