php从数组中随机获取值，拼接成新的随机字符串

//数组封装
$enStr = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9'];

//打乱数组顺序
shuffle($enStr);

//获取新的数值，因为每次调用函数，数组都是重新排序过的，所以随机取值 array_slice($array,$offset,$length) 开始取值的第一个数 $offset 也可以是变动的
$newEnStr = array_slice($enStr,1,25);

//拼接随机字符串
echo implode('', $newEnStr);
die;