Guess Country by Locale

guessCountry.php

<?php
    function guess_country_by_locale ($locale) {
        $tokens = explode('-', strtolower($locale));

        if (isset($tokens[1]) === true) {
            $country = $tokens[1];

            if ($country !== '') {
                switch ($country) {
                    case 'hans':
                        return 'CN';
                    case 'hant':
                        return 'TW';
                    case '419':
                        return 'MX';
                    default:
                        return strtoupper($country);
                }
            }
        }

        $lang = $tokens[0];

        if (strlen($lang) !== 2 ||
            ctype_alpha($lang) === false ||
            $lang === 'eo') {
            return false;
        }

        $map = array(
            'aa' => 'ET',
            'ab' => 'GE',
            'am' => 'ET',
            'ar' => 'SA',
            'as' => 'IN',
            'av' => 'RU',
            'be' => 'BY',
            'bn' => 'BD',
            'br' => 'FR',
            'bs' => 'BA',
            'ca' => 'ES',
            'ce' => 'RU',
            'cs' => 'CZ',
            'cy' => 'GB',
            'da' => 'DK',
            'el' => 'GR',
            'en' => 'US',
            'et' => 'EE',
            'eu' => 'ES',
            'fa' => 'IR',
            'ga' => 'IE',
            'gl' => 'ES',
            'gn' => 'PY',
            'gu' => 'IN',
            'he' => 'IL',
            'hi' => 'IN',
            'hy' => 'AM',
            'in' => 'ID',
            'iw' => 'IL',
            'ja' => 'JP',
            'jv' => 'ID',
            'ka' => 'GE',
            'kk' => 'KZ',
            'km' => 'KH',
            'kn' => 'IN',
            'ko' => 'KR',
            'kw' => 'GB',
            'ky' => 'KG',
            'la' => 'IT',
            'lb' => 'LU',
            'lo' => 'LA',
            'ml' => 'IN',
            'mr' => 'IN',
            'ms' => 'MY',
            'my' => 'MM',
            'nb' => 'NO',
            'ne' => 'NP',
            'nn' => 'NO',
            'ny' => 'MW',
            'om' => 'ET',
            'or' => 'IN',
            'os' => 'RU',
            'pa' => 'IN',
            'ps' => 'AF',
            'sa' => 'IN',
            'sd' => 'PK',
            'si' => 'LK',
            'sl' => 'SI',
            'sm' => 'WS',
            'sn' => 'ZW',
            'sq' => 'AL',
            'sr' => 'RS',
            'ss' => 'SZ',
            'su' => 'ID',
            'sv' => 'SE',
            'sw' => 'KE',
            'ta' => 'IN',
            'te' => 'IN',
            'tg' => 'TJ',
            'ti' => 'ET',
            'tl' => 'PH',
            'tk' => 'TM',
            'ts' => 'ZA',
            'tt' => 'RU',
            'ug' => 'CN',
            'uk' => 'UA',
            'ur' => 'PK',
            'vi' => 'VN',
            'za' => 'CN',
            'zh' => 'CN'
        );

        return isset($map[$lang]) === true ?
            $map[$lang] :
            strtoupper($lang);
    }
?>