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$code .= mb_substr($this->charset, $rnum, 1,'UTF-8');
此代码在我的系统中运行,但是当我将其上传到我的服务器时,它显示错误。
mbstring函数默认是不开启的,你需要编译支持mbstring的PHP(或者安装一个支持mbstring的包)。更多信息:http ://es1.php.net/manual/en/mbstring.installation.php