/**
* 随机生成字符串
* @param int $length
*/
<?php
$length = "12";//字符串长度
$characters = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
$randomString = "";
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, strlen($characters) - 1)];
}
echo $randomString;
?>
根据自己需要封装即可