I was looking for a while for ISO3166-1-Alpha-2 both with country currency code. I wasn't able to find the best example for this. I made my own. Cheers.

.php

<?php
/**
 * Created by PhpStorm.
 * Date => 4/18/16
 * Time => 1 =>49 PM
 */

return [
  'AF' => 'AFG',
  'AL' => 'ALL',
  'DZ' => 'DZD',
  'AS' => 'USD',
  'AD' => 'EUR',
  'XO' => 'AOA',
  'AI' => 'XCD',
  'AQ' => 'USD',
  'AG' => 'XCD',
  'AR' => 'ARS',
  'AM' => 'AMD',
  'AW' => 'AWG',
  'AU' => 'AUD',
  'AT' => 'EUR',
  'AZ' => 'AZN',
  'BS' => 'BSD',
  'BH' => 'BHD',
  'BD' => 'BDT',
  'BB' => 'BBD',
  'BY' => 'BYR',
  'BE' => 'EUR',
  'BZ' => 'BZD',
  'BJ' => 'XOF',
  'BM' => 'BMD',
  'BT' => 'INR',
  'BO' => 'BOB',
  'BQ' => 'USD',
  'BA' => 'BAM',
  'BW' => 'BWP',
  'BV' => 'NOK',
  'BR' => 'BRL',
  'IO' => 'USD',
  'BN' => 'BND',
  'BG' => 'BGN',
  'BF' => 'XOF',
  'BI' => 'BIF',
  'KH' => 'KHR',
  'CM' => 'XAF',
  'CA' => 'CAD',
  'CV' => 'CVE',
  'KY' => 'KYD',
  'CF' => 'XAF',
  'TD' => 'XAF',
  'CL' => 'CLP',
  'CN' => 'CNY',
  'CX' => 'AUD',
  'CC' => 'AUD',
  'CO' => 'COP',
  'KM' => 'KMF',
  'CG' => 'XAF',
  'CD' => 'XAF',
  'CK' => 'NZD',
  'CR' => 'CRC',
  'HR' => 'HRK',
  'CU' => 'CUP',
  'CW' => 'ANG',
  'CY' => 'EUR',
  'CZ' => 'CZK',
  'CI' => 'XOF',
  'DK' => 'DKK',
  'DJ' => 'DJF',
  'DM' => 'XCD',
  'DO' => 'DOP',
  'EC' => 'USD',
  'EG' => 'EGP',
  'SV' => 'USD',
  'GQ' => 'XAF',
  'ER' => 'ERN',
  'EE' => 'EUR',
  'ET' => 'ETB',
  'FK' => 'FKP',
  'FO' => 'DKK',
  'FJ' => 'FJD',
  'FI' => 'EUR',
  'FR' => 'EUR',
  'GF' => 'EUR',
  'PF' => 'XPF',
  'TF' => 'EUR',
  'GA' => 'XAF',
  'GE' => 'GEL',
  'DE' => 'EUR',
  'GH' => 'GHS',
  'GI' => 'GIP',
  'GR' => 'EUR',
  'GL' => 'DKK',
  'GD' => 'XCD',
  'GP' => 'EUR',
  'GU' => 'USD',
  'GT' => 'GTQ',
  'GG' => 'GBP',
  'GN' => 'GNF',
  'GW' => 'XOF',
  'GY' => 'GYD',
  'HT' => 'USD',
  'HM' => 'AUD',
  'VA' => 'EUR',
  'HN' => 'HNL',
  'HK' => 'HKD',
  'HU' => 'HUF',
  'IS' => 'ISK',
  'IN' => 'INR',
  'ID' => 'IDR',
  'IR' => 'IRR',
  'IQ' => 'IQD',
  'IE' => 'EUR',
  'IM' => 'GBP',
  'IL' => 'ILS',
  'IT' => 'EUR',
  'JM' => 'JMD',
  'JP' => 'JPY',
  'JE' => 'GBP',
  'JO' => 'JOD',
  'KZ' => 'KZT',
  'KE' => 'KES',
  'KI' => 'AUD',
  'KP' => 'KPW',
  'KR' => 'KRW',
  'KW' => 'KWD',
  'KG' => 'KGS',
  'LA' => 'LAK',
  'LV' => 'EUR',
  'LB' => 'LBP',
  'LS' => 'ZAR',
  'LR' => 'LRD',
  'LY' => 'LYD',
  'LI' => 'CHF',
  'LT' => 'EUR',
  'LU' => 'EUR',
  'MO' => 'MOP',
  'MK' => 'MKD',
  'MG' => 'MGA',
  'MW' => 'MWK',
  'MY' => 'MYR',
  'MV' => 'MVR',
  'ML' => 'XOF',
  'MT' => 'EUR',
  'MH' => 'USD',
  'MQ' => 'EUR',
  'MR' => 'MRO',
  'MU' => 'MUR',
  'MX' => 'MXN',
  'FM' => 'USD',
  'MD' => 'MDL',
  'MC' => 'EUR',
  'MN' => 'MNT',
  'ME' => 'EUR',
  'MS' => 'XCD',
  'MA' => 'MAD',
  'MZ' => 'MZN',
  'MM' => 'MMK',
  'NA' => 'ZAR',
  'NR' => 'AUD',
  'NP' => 'NPR',
  'NL' => 'EUR',
  'NC' => 'XPF',
  'NZ' => 'NZD',
  'NI' => 'NIO',
  'NE' => 'XOF',
  'NG' => 'NGN',
  'NU' => 'NZD',
  'NF' => 'AUD',
  'MP' => 'USD',
  'NO' => 'NOK',
  'OM' => 'OMR',
  'PK' => 'PKR',
  'PW' => 'USD',
  'PS' => 'USD',
  'PA' => 'USD',
  'PG' => 'PGK',
  'PY' => 'PYG',
  'PE' => 'PEN',
  'PH' => 'PHP',
  'PN' => 'NZD',
  'PL' => 'PLN',
  'PT' => 'EUR',
  'PR' => 'USD',
  'QA' => 'QAR',
  'RO' => 'RON',
  'RU' => 'RUB',
  'RW' => 'RWF',
  'RE' => 'EUR',
  'BL' => 'EUR',
  'SH' => 'SHP',
  'KN' => 'XCD',
  'LC' => 'XCD',
  'MF' => 'EUR',
  'PM' => 'EUR',
  'VC' => 'XCD',
  'WS' => 'WST',
  'SM' => 'EUR',
  'ST' => 'STD',
  'SA' => 'SAR',
  'SN' => 'XOF',
  'RS' => 'RSD',
  'SC' => 'SCR',
  'SL' => 'SLL',
  'SG' => 'SGD',
  'SX' => 'ANG',
  'SK' => 'EUR',
  'SI' => 'EUR',
  'SB' => 'SBD',
  'SO' => 'SOS',
  'ZA' => 'ZAR',
  'GS' => 'USD',
  'SS' => 'SSP',
  'ES' => 'EUR',
  'LK' => 'LKR',
  'SD' => 'SDG',
  'SR' => 'SRD',
  'SJ' => 'NOK',
  'SZ' => 'SZL',
  'SE' => 'SEK',
  'CH' => 'CHF',
  'SY' => 'SYP',
  'TW' => 'TWD',
  'TJ' => 'TJS',
  'TZ' => 'TZS',
  'TH' => 'THB',
  'TL' => 'USD',
  'TG' => 'XOF',
  'TK' => 'NZD',
  'TO' => 'TOP',
  'TT' => 'TTD',
  'TR' => 'TRY',
  'TM' => 'TMT',
  'TC' => 'USD',
  'TV' => 'AUD',
  'UG' => 'UGX',
  'UA' => 'UAH',
  'AE' => 'AED',
  'GB' => 'GBP',
  'US' => 'USD',
  'UM' => 'USD',
  'UY' => 'UYU',
  'UZ' => 'UZS',
  'VU' => 'VUV',
  'VE' => 'VEF',
  'VN' => 'VND',
  'VG' => 'USD',
  'VI' => 'USD',
  'WF' => 'XPF',
  'EH' => 'MAD',
  'YE' => 'YER',
  'ZM' => 'ZMW',
  'ZW' => 'ZWL',
  'AX' => 'EUR',
];

Thanks. That helps me a lot.

Your welcome! I have been struggling with this much time, I couldn't find it everywhere so I rewrote it by myself. I took me 2-3 hours. :D :)