我找到了一个更好的答案.受到 https://***.com/a/4923410/80353

I found a better answer. Inspired by https://***.com/a/4923410/80353

header('Content-Type: text/html; charset=utf-8');
mb_internal_encoding('utf-8');

function isThisChineseText($text) {
    return preg_match("/\p{Han}+/u", $text);
}