ThinkPHP v5.1.41 点击下载 1 composer在线安装 1.1 修改composer国内源 composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/ 1.2 查看composer源地址是否更改 D:\phpstudy_pro\WW…

function mt_string($len){ $str = md5(uniqid(mt_rand(),1)); return substr($str, 0, $len); } $a = mt_string(8); echo $a; 函数返回值得到随机数，$len是形参，返回的字符串长度