php 随机生成时间:2023-03-09 01:47:27 php随机生成6位字符串: $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz'; $max = strlen($str)-1; for ($i=0; $i <6 ; $i++){ $invite1.=$str[rand(0,$max)]; }