<?php
use Luracast\Restler\RestException;

class Currency
{
    function format($number = NULL)
    {
        /**
        There is a better way to validate in Restler 3
        Here we manually validate to show the use of exceptions
         */
        if (is_null($number))
            throw new RestException(400);
        if (!is_numeric($number))
            throw new RestException(400, 'not a valid number');

        // let's print the international format for the en_US locale
        setlocale(LC_MONETARY, 'en_US');
        return money_format('%i', $number);
    }
}