Update_rate.php

<?php

defined('BASEPATH') or exit('No direct script access allowed');

class Update_rate extends CI_Controller
{
    public function index(){
        $content = file_get_contents("https://api.exchangeratesapi.io/latest?base=USD");
        $result=json_decode($content, true);
        $array_payment = ['paypal', 'perfectmoney', 'webmoney'];

        foreach($array_payment as $output) {
            $rate_bulat = round($result['rates']['IDR']);
            $this->payment_model($output, $rate_bulat);
        }
    }

    public function payment_model($payment, $rate)
    {
        $data = array ('rate' => $rate);
        $this->db->where('key', $payment);
        $this->db->update('payments', $data);
    }
}