我以前一直用这个
preg_match('~[\x7f-\xff]+~is', $string, $tmp);
今天才发现,上面这个也会匹配到一些欧洲国家的字符
应该用下面这个,注意修正符 u
preg_match('~[\x{4e00}-\x{9fa5}]+~u', $string, $tmp);
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