jimmerioles/bitcoin-currency-converter-php

<?php

use Jimmerioles\BitcoinCurrencyConverter\Util\CurrencyCodeChecker;

if (! function_exists('is_crypto_currency')) {
    /**
     * Check if cryptocurrency.
     *
     * @param  string  $currencyCode
     * @return boolean
     */
    function is_crypto_currency($currencyCode)
    {
        return (new CurrencyCodeChecker)->isCryptoCurrency($currencyCode);
    }
}

if (! function_exists('is_fiat_currency')) {
    /**
     * Check if fiat currency.
     *
     * @param  string  $currencyCode
     * @return boolean
     */
    function is_fiat_currency($currencyCode)
    {
        return (new CurrencyCodeChecker)->isFiatCurrency($currencyCode);
    }
}

if (! function_exists('is_currency_code')) {
    /**
     * Check if currency code.
     *
     * @param  string  $currencyCode
     * @return boolean
     */
    function is_currency_code($currencyCode)
    {
        return (new CurrencyCodeChecker)->isCurrencyCode($currencyCode);
    }
}