Source of gettextwrapper.inc.php - Zabbix

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/**
 * Initialize locale environment and gettext translations depending on language selected by user.
 *
 * Note: should be called before including file includes/translateDefines.inc.php.
 *
 * @param string $language    Locale language prefix like en_US, ru_RU etc.
 * @param string $error       Message on failure.
 *
 * @return bool    Whether locale could be switched.
 */
function setupLocale(string $language, string &$error = null): bool {
function setupLocale(string $language, ?string &$error = null): bool {
    $locale_variants = zbx_locale_variants($language);
    $locale_set = false;
​
    ini_set('default_charset', 'UTF-8');
    ini_set('mbstring.detect_order', 'UTF-8, ISO-8859-1, JIS, SJIS');
​
    // Also, C locale is always present.
    setlocale(LC_ALL, 'C');
​
    if (function_exists('bindtextdomain')) {