php從數組中隨機獲取值，拼接成新的隨機字符串

//數組封裝
$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'];

//打亂數組順序
shuffle($enStr);

//獲取新的數值，因爲每次調用函數，數組都是重新排序過的，所以隨機取值 array_slice($array,$offset,$length) 開始取值的第一個數 $offset 也可以是變動的
$newEnStr = array_slice($enStr,1,25);

//拼接隨機字符串
echo implode('', $newEnStr);
die;